Last updated 2026-08-19
TL;DR
Colorado does not issue a statewide backflow tester license. Water systems under 5 CCR 1002-11 need annual tests by a certified technician, usually ASSE 5110, ABPA, or USC. First-year cost is private tuition, a gauge kit, calibration, and utility signup. Timeline is about one training week plus local paperwork. Confirm every fee with the school, the utility, and DORA if you also repair.
How much does backflow tester cost in Colorado?
Colorado does not set tuition and does not collect a backflow tester license fee, because DORA does not issue that license. Your cost is a stack: private training, a differential pressure gauge, annual calibration, and whatever each water utility charges to put you on its tester list. Two new testers in the same county can spend very different amounts.
Budget four buckets. Training is first. ASSE 5110 style courses in this region usually run as 40-hour classes with a written test and a hands-on practical. Schools set the price. No one keeps a clean public dataset of every Colorado classroom, so treat internet “average tuition” posts as gossip. Call two providers and ask what the quote includes (exam seat, wallet card, one retake, lunch, parking).
Equipment is the second bucket and it can dwarf the class if you buy new. A 5-valve analog kit is a manufacturer product, not a state-issued tool. Street prices move with supply and with whether the gauge ships already calibrated. I would not finance a premium digital kit before a utility has actually accepted you. A clean used kit with a fresh calibration certificate is how a lot of working testers start, and there is nothing wrong with that.
The third bucket is recurring. Gauges need calibration on a cycle your utility will enforce, usually every year. Cert bodies recertify on their own clock (ASSE is commonly three years). Hoses, fittings, and a spare set of adapters cost little next to a dead week in July because your sticker lapsed.
The fourth bucket is business overhead if you are not a W-2 employee. Colorado Secretary of State has long listed a $50 articles of organization fee for a limited liability company on the business fee schedule. Confirm the live amount before you file. Fees change. [7]
Test only as an employee of a shop, and your personal cash outlay can be just the class. Go independent on the Front Range, and you add insurance, entity paper, and unpaid time learning each supplier’s report portal. Skip the national “license in a box” upsells. They do not replace the credential your local public water system names in writing.
A backflow tester Colorado utilities will actually dispatch is certified, calibrated, and on that supplier’s list. That is the whole cost story. Everything else is optional branding.
Do you need a license for backflow tester in Colorado?
No. Colorado does not issue a standalone backflow tester license through the Department of Regulatory Agencies. What you need is a tester certification the public water system will accept under the drinking-water rules, plus a plumbing license if you repair or install the assembly instead of only testing it.
5 CCR 1002-11, the Colorado Primary Drinking Water Regulations, puts the legal duty on the supplier. The water system has to run a cross-connection control program and see that assemblies protecting the system are tested. [1] CDPHE’s cross-connection control program page is the state landing point for those rules. [2] CDPHE does not mail you a separate “Colorado tester” card.
The EPA Cross-Connection Control Manual (EPA 816-R-03-002) states, “Backflow is the undesirable reversal of flow of water or mixtures of water and other liquids, gases, or other substances into the distribution pipes of the potable supply of water from any source or sources.” [3] Regulation 11 is how Colorado makes public water systems control that risk. Your cert is how the supplier proves a qualified person did the field work.
Online chatter that says “get your Colorado backflow license” is usually mixing up three different papers. One is an ASSE 5110, ABPA, or USC FCCCHR tester credential. One is a city or utility registration number. One is a journeyman or master plumber license if you put wrenches on the assembly. Only the plumber license is a DORA credential. [5][6]
| Who | What they actually issue | What they do not issue |
|---|---|---|
| CDPHE (Regulation 11) | Rules for public water systems | A tester license card |
| Local water utility | Approved tester list and test forms | A statewide license |
| ASSE, ABPA, or USC | Tester certification | A Colorado license |
| DORA State Plumbing Board | Plumber licenses | A backflow-only license |
| Colorado Secretary of State | Entity and trade name filings | Any tester credential |
If a school implies the state sells a backflow tester license, walk. Ask them which utility packet they train you to fill out. That one question sorts the serious programs from the brochure mills.
How long does it take to become a backflow tester in Colorado?
Most people finish the class and the exam in one week. ASSE 5110 training is commonly delivered as 40 hours with a written test and a practical. Passing those exams makes you a certified tester. Getting paid work takes longer, because each water utility has its own signup, insurance ask, and report format.
There is no Colorado application queue to wait out. There is no state tester license. That is the honest timeline. I have watched people lose a month hunting a “permit number” that does not exist.
After the card is in your wallet, budget calendar time for a gauge calibration certificate, a W-9 if you subcontract, and the online tester portal Denver Water, Aurora Water, Fort Collins, or Colorado Springs Utilities wants you to use. [4][10][11] Some suppliers review new testers in a few days. Some are slower. Confirm with the utility you care about. No one can honestly promise a statewide processing time, and anyone who does is guessing.
If you also need a journeyman or master plumber license to do repairs, that clock is different. Hours, exams, and board review live on the State Plumbing Board side. [6] Do not mix the two. Tester cert is a training week. Plumbing licensure is a trade path.
A workable personal plan looks like this. Book the 40-hour class. Schedule calibration the week you pass, not “sometime this summer.” Submit the first utility packet before you print business cards. Then take the second utility. Stacking five supplier applications on day one just creates five incomplete files.
What tester certifications do Colorado water systems accept?
Most large Colorado suppliers accept tester certifications from ASSE, ABPA, or the USC Foundation for Cross-Connection Control and Hydraulic Research. Confirm the current written list with the water system that owns the service connection. Regulation 11 is what forces the supplier to use a certified cross-connection control technician. The department still does not issue you a state tester card. [1][2]
ASSE 5110 is the professional qualifications standard for backflow prevention assembly testers. [8] USC FCCCHR runs its own tester certification program. [9] ABPA runs one too. A multi-day course that ends in a hands-on exam is the usual shape for all three. A slide-deck webinar with no practical is a red flag. Utilities want to see that you can hook up a gauge.
Denver Water publishes contractor-facing backflow prevention requirements and expects certified testers on assemblies that protect its system. [4] Colorado Springs Utilities keeps a cross-connection control page for the same reason. [10] City of Aurora does as well. [11] Work the whole Front Range and you will juggle several logins and several slightly different test report forms. Annoying. Normal.
Pick the cert your first target utility names in writing. Do not collect extra alphabet soup in week one. Recertifying two bodies later is real money and real days off. One accepted card plus a current calibration sticker beats three expired ones.
The EPA manual also defines a cross-connection as “any temporary or permanent connection between a public water system or consumer's potable water system and any source or system containing nonpotable water or other substances.” [3] Your job is the field test that shows the assembly still holds. The cert is only the ticket onto the site.
Do you need a Colorado plumbing license to test assemblies?
For test-only work, many Colorado water systems will accept a certified tester who is not a licensed plumber. For install, replace, or repair of the assembly, you are in licensed plumbing work under the State Plumbing Board unless a narrow exception applies. A homeowner doing limited work on their own single-family home is the example people usually mean, and even that has limits. Read the board rules. Do not take a stranger’s jobsite story as law. [5][6]
3 CCR 720-1 is the Plumbing Board rulebook. DORA’s plumbing applications page is where the live forms and the live fee table sit. [5][6] I am not going to paste a plumber application fee here. Those numbers change. Look at the board page the morning you apply.
Here is my advice if you are new: get the tester cert first. Work test-only under a shop, or as a sub who does not touch wrenches. Then decide if the plumbing license is worth the hours. Repair pays more when an assembly fails. It also puts you under apprenticeship math, exams, and continuing education the tester card does not.
Shops sometimes want testers who can also swap a failed RP. That is a hiring preference, not a Regulation 11 rule. The drinking-water rule cares that a certified technician tested the assembly. The plumbing board cares who broke the unions and installed the new body. Keep those two sentences separate when you advertise.
Already hold a Colorado journeyman or master plumber license? You still need the tester certification the utility lists. A plumber license is not an automatic backflow tester credential. I have watched licensed plumbers get test reports rejected because the gauge sticker was expired or the cert body was wrong for that supplier.
What does a first-year tester budget look like in Colorado?
There is no official first-year total. A new tester who already has a shop job might spend only tuition and exam fees. An independent who buys a new gauge, files an LLC, and carries insurance will spend several times that. The gap is equipment and overhead, not a state invoice.
Use this as a planning table, not a quote. Private-market ranges move, and I will not pretend a blog has a better price list than the vendor in front of you.
| Line item | Official state fee? | What you should do |
|---|---|---|
| 40-hour tester course and exam | No | Get written quotes from two schools |
| Differential pressure gauge kit | No | Quote new and used, with calibration |
| Annual gauge calibration | No | Ask a Colorado lab for a certificate price |
| Cert-body recert in later years | No | Ask ASSE, ABPA, or USC |
| LLC articles of organization | Yes, SOS fee schedule (commonly listed at $50) | Confirm on the SOS schedule before you pay [7] |
| Statement of trade name | Yes, SOS fee schedule | Confirm at SOS [7] |
| Sales tax account if you sell parts | Department of Revenue rules | Read the current DOR license instructions [13] |
| Workers' compensation if you have employees | CDLE requirement | Read the Division of Workers' Compensation employer page [12] |
| Plumbing license (repairs) | DORA fee table | Confirm on the Plumbing Board applications page [6] |
| Utility tester registration | Local | Call each supplier |
Skip the van wrap, the second gauge, and custom report software in year one. Get one calibrated kit and keep the cert current. If the shop already owns a kit, use it and put your cash into the class.
Want the paper checklist in one place (what to take to class, what utilities usually ask for, which standards people mean when they say 5110 or 5115)? The $149 one-time ASSE 5110/5115 Tester Kit from ASSEPath is a document pack. It is not a Colorado license and it is not a gauge. This article stands on its own if you never click it.
People also ask how this stack compares with other states. The short version: Colorado is a cert-plus-utility-list state. Read the backflow tester cost in Arizona and backflow tester cost in Idaho pieces if you work those borders.
How do you get on a Colorado utility approved tester list?
You apply to the water system, not to a single state portal. Send your current tester certification, a recent gauge calibration certificate, photo ID if they ask, and whatever insurance certificate they name. Denver Water, Colorado Springs Utilities, and Aurora Water each describe their backflow programs on their own sites. [4][10][11]
Some utilities want you inside their electronic reporting tool before they will accept a test. Some still take a PDF or a portal upload that looks like 2014. Read the current tester packet. Last year’s form will bounce.
Work statewide (ski towns plus the Front Range plus a special district that only has a clerk on Tuesdays) and you will repeat this process. There is no reciprocity card that auto-enrolls you in every Colorado supplier. Regulation 11 binds the supplier. The supplier binds you. [1]
Waste of money: paying a middleman to “register you statewide.” They cannot. The clerk at a small sanitation district has never heard of their portal.
A practical order if you live along I-25: pick the supplier that owns most of the assemblies you can actually drive to this month. Get on that list. Run tests. Then add the next city. Empty approved-tester status in four cities does not pay for calibration.
What does gauge calibration and recertification cost later?
Calibration is annual in practice because utilities will reject tests run with an out-of-date gauge. Labs set the price. I will not invent a Colorado lab fee. Call two labs and ask for a 5-valve differential pressure gauge calibration with a written certificate that names the serial number.
Recertification follows the body that issued your card. ASSE 5110 holders commonly recertify on a 3-year cycle with a written exam or a refresher-plus-exam, depending on the provider. [8] That is a private fee. Budget a full day off, plus shipping time if you mail the gauge.
People lose April and May work because the sticker lapsed during ski season. Put the expiration on a calendar the day you pass the class. Same for the cert card. The state will not send you a reminder. CDPHE is watching the water system, not your wallet card. [2]
If a lab offers a same-day turnaround for more money, pay it during peak test season. Sitting a week without a gauge costs more than the rush fee, assuming you actually have work on the book. No work yet? The cheap slow calibration is fine.
What business filings do independent testers need in Colorado?
Operate under your own name as a sole proprietor and a trade name filing with the Colorado Secretary of State is the usual first paper. Want an LLC? You file articles of organization. The SOS business fee schedule has listed $50 for LLC articles of organization. Confirm before you swipe a card. [7]
A sales tax account through the Department of Revenue matters if you sell parts or marked-up assemblies. It may not matter if you only invoice a test labor line. Read DOR’s current instructions instead of copying another tester’s setup. [13] Tax facts go stale in comment threads.
Hire anyone and workers' compensation is not a vibe. It is an employer duty the Division of Workers' Compensation explains on its employer page. [12] Solo testers still need to think about general liability because utilities ask for certificates. I do not have an honest statewide premium number. Call a broker who already writes plumbing and fire-protection accounts.
City business licenses are local. Denver, Aurora, Colorado Springs, and unincorporated counties are different packets. I will not invent those fees. Call the clerk. Working inside a single special district? Ask that district whether they care about a municipal business license at all.
This is reference reporting, not legal advice. Confirm filings with SOS, DOR, CDLE, and the city before you print invoices.
What does a backflow test cost the property owner in Colorado?
There is no Colorado price control on a backflow test. Property owners pay whatever the tester and the local market will bear. I have no honest statewide average from a government study. Anyone publishing “the average Colorado backflow test is this many dollars” without a dataset is guessing.
Commercial assemblies, vault access, confined-space rules, and failed tests that need a return trip cost more than a residential double-check in an open side yard. Ask two testers in the same zip code and you will get two numbers. That is normal.
Your cost to enter the trade and the customer’s invoice are different conversations. Do not set your price from a national Facebook thread, and do not copy a Denver commercial rate into a small Western Slope town. You will sit parked.
Water systems care that the assembly was tested by a certified person and that the report landed on time. [1][4] They generally do not set your retail price. If a district publishes a list of testers, that is a convenience list, not a rate sheet.
How does Colorado compare with other states on tester cost?
Colorado is a certification-plus-utility-list state, not a single-license state. That is closer to how a lot of western states work, and different from states that put testers under one plumbing-board card with a published fee table. Your big checks here go to a private school and a gauge vendor, not to DORA.
Might work across a border, or comparing paper paths before you move? Start with states that actually sit on Colorado’s job market. The backflow tester cost in Arizona guide is the one people ask for first. Backflow tester cost in California matters if you already hold USC or ASSE and think the card travels (the card may travel; the local water purveyor still runs the list).
Backflow tester cost in Idaho is the other mountain-west comparison that comes up. Farther afield, the backflow tester cost in Illinois, backflow tester cost in Florida, and backflow tester cost in Georgia writeups show what a more board-heavy path looks like. Use them as contrast, not as Colorado instructions.
The expensive mistake is assuming one state’s published license fee exists here. It does not. 5 CCR 1002-11 is a drinking-water rule aimed at suppliers. [1] Your wallet still empties. It empties at the school, the lab, and the insurer.
What records should you keep after each Colorado backflow test?
Keep the test report the supplier requires, the gauge serial number, the calibration date, and the assembly’s serial, size, make, model, and location. Regulation 11 makes the public water system keep a program and records. You make their file complete. Incomplete reports come back, and they come back during the week you are already booked. [1]
Hold copies longer than you think. When a tester card or a failed assembly is challenged two seasons later, the paper trail is what you have. Your memory of a Thursday in July is not a record.
The EPA manual is still the national reference text a lot of operators trained on. [3] It will not tell you which Denver Water button to click. For that, use the utility packet. [4]
Want a document checklist after you have read the state and utility rules? It is at /start. ASSEPath is an independent publisher, not a law firm and not a service company. No article can promise approval, a quota, or a processing time. Confirm live fees and forms with the school, the cert body, the water system, DORA, and the Secretary of State.
Frequently asked questions
Do you need a license for backflow tester in Colorado?
No statewide backflow tester license exists at DORA. You need a tester certification the public water system accepts under 5 CCR 1002-11, usually ASSE 5110, ABPA, or USC FCCCHR, plus signup on that utility’s tester list. A Colorado plumbing license is a separate credential and is for install and repair work, not for the tester card itself. Confirm the accepted certs with the supplier.
How much does backflow tester cost in Colorado?
There is no official state price. First-year cost is private 40-hour course tuition, a differential pressure gauge, calibration, and any utility registration. Independents also face SOS entity fees (the fee schedule has listed $50 for LLC articles of organization), insurance, and local business licenses. Confirm every number with the school, SOS, the lab, and the water system before you pay.
How long does backflow tester take in Colorado?
The class and exam usually take one week, commonly 40 hours for an ASSE 5110 style course. There is no DORA wait because there is no state tester license. Paid work starts after the water utility accepts your cert, calibration, and any insurance they require. That local signup can be days or longer. Confirm with the supplier. Plumbing licensure for repairs is a much longer path.
Does CDPHE issue a backflow tester card?
No. CDPHE writes and enforces the drinking-water rules that make public water systems run cross-connection control programs. The department does not mail a state tester license. Your card comes from a cert body such as ASSE, ABPA, or USC, and your permission to file tests comes from each water system that puts you on its list.
Can I test in Denver with only an ASSE 5110?
ASSE 5110 is widely recognized, and Denver Water requires certified testers on assemblies that protect its system. You still have to complete Denver Water’s current tester signup, keep the gauge calibration current, and use the report method they specify. Read their backflow prevention contractor page and confirm the live packet. Do not assume the card alone files a test.
Do I need insurance to get on a tester list?
Many utilities ask for a certificate of insurance before they will accept your tests. There is no single Colorado statute that sets a tester’s liability limit for this purpose. The water system names what it wants in the tester packet. Call that supplier and your broker. If you hire employees, workers' compensation is a separate CDLE duty, not a substitute for general liability.
Is a used test kit legal in Colorado?
Yes, if it is the right type of differential pressure gauge, it works, and it has a current calibration certificate the utility will accept. Colorado does not issue kits and does not ban used ones. A dead or uncalibrated bargain kit is wasted money. Get the serial number on the cert and keep that paper with every report.
How often must backflow assemblies be tested in Colorado?
Public water systems under 5 CCR 1002-11 must see that assemblies protecting the system are tested on the schedule in Regulation 11, which includes testing at least annually and after install, repair, or relocation as the rule requires. The supplier’s local program may be stricter. Confirm with the water system that owns the connection, not with a national forum.
Can a homeowner test their own backflow preventer in Colorado?
Usually no, not if the test has to satisfy the public water system. Suppliers need a certified cross-connection control technician and a proper report. Homeowners may have limited rights to do certain plumbing on their own single-family home under board rules, but that is not the same as being an accepted tester. Ask the utility who may file the annual test.
Does a Colorado plumber license automatically let me test backflow?
No. A journeyman or master plumber license covers licensed plumbing work. It does not replace the tester certification and utility registration used for assembly tests. Plenty of licensed plumbers still take ASSE 5110 or an equivalent course so water systems will accept their reports. Repair without the tester cert, or test without the cert the supplier lists, and the file is incomplete.
Are online-only backflow tester courses accepted in Colorado?
Treat fully online courses with no hands-on exam as a high risk. Utilities and cert bodies want proof you can hook up a gauge and run the procedures. ASSE 5110 style programs are built around knowledge plus a practical. Before you pay, ask the school which Colorado suppliers have taken their graduates this year, and ask the utility whether that card is on the accepted list.
What happens if my gauge calibration expires mid-season?
Water systems will reject tests run after the calibration date on the certificate. You stop testing until a lab returns the gauge with a new cert. That can wipe out a week of appointments. Calibrate before the rush, keep a copy of the cert in the truck, and put the next due date on a calendar the day the lab hands the kit back.
Do I need a contractor license just to invoice backflow tests?
Colorado does not use one statewide contractor number for tester-only work the way some states do. You may still need a city business license, a trade name or LLC at the Secretary of State, and a sales tax account if you sell parts. Each city is different. Confirm with the clerk in the city where you are based and with any utility that asks for proof of business status.
Can I work multiple Colorado cities on one certification?
The cert card can travel. The approved-tester lists do not. Each public water system runs its own program under Regulation 11, so you repeat signup, reporting, and sometimes insurance limits. Plan on several packets if you want Denver, Aurora, and Colorado Springs in the same season. There is no statewide auto-enrollment.
Sources
- Colorado Secretary of State, 5 CCR 1002-11 Colorado Primary Drinking Water Regulations: 5 CCR 1002-11 is the Colorado Primary Drinking Water Regulation that requires public water systems to operate a cross-connection control program and to have protecting assemblies tested by certified technicians.
- CDPHE, Drinking Water Cross-Connection Control program page: CDPHE administers cross-connection control requirements for Colorado public water systems and is the state program contact for Regulation 11 CCC rules.
- U.S. EPA, Cross-Connection Control Manual (EPA 816-R-03-002): EPA defines backflow as the undesirable reversal of flow into the potable supply and defines a cross-connection as any connection between potable piping and a nonpotable source.
- Colorado Secretary of State, 3 CCR 720-1 State Plumbing Board Rules: 3 CCR 720-1 is the Colorado State Plumbing Board rulebook that governs licensed plumbing practice, which covers install and repair of assemblies.
- Colorado DORA, State Plumbing Board Applications: DORA’s Plumbing Board applications page is the live source for plumber application forms and current board fees.
- USC Foundation for Cross-Connection Control and Hydraulic Research, Tester certification: USC FCCCHR operates a tester certification program that Colorado water systems commonly list among accepted credentials.
- Colorado CDLE, Division of Workers' Compensation employer page: Colorado employers with employees must follow Division of Workers' Compensation coverage duties explained on the CDLE employer page.
- Colorado Department of Revenue, How to obtain a sales tax license: The Colorado Department of Revenue publishes the current process for obtaining a sales tax license, which matters if a tester sells parts.