Last updated 2026-08-19
TL;DR
Colorado does not issue a statewide backflow tester license. You recertify with ASSE, ABPA, or another CDPHE-recognized program when that card expires (commonly every three years), then you re-register with each water supplier that takes your tests. Plumbing licenses renew separately at DPO if you hold one. Confirm current forms and fees with the cert body, DPO, and the utility. Nobody can honestly guarantee processing time.
Do you need a license for backflow tester in Colorado?
No. Colorado does not issue a statewide backflow tester license. You need a third-party tester certification from a program CDPHE recognizes, and you need to stay listed with each water supplier that accepts your tests. A plumbing license is separate paper, and you only need it if you install or repair assemblies. Confirm both tracks before you print business cards. [2][5]
People type backflow tester colorado into a search bar and expect a DORA card that says tester. That card does not exist. Regulation 11 is a drinking water rule pointed at public water suppliers. The supplier has to run a cross-connection control program and use certified technicians. You are a contractor to that program, not a state licensee. [2][3]
EPA's Cross-Connection Control Manual defines backflow as "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." [1] That is the hazard the water system owns. Your card is how the system proves the tester was qualified.
If you only test and report, many districts take a current ASSE, ABPA, or equivalent card plus a calibrated gauge. Swap a failed assembly and you have likely stepped into plumbing work. C.R.S. Title 12, Article 155 is the Colorado plumbing license statute administered by DPO. Read the article. Then call the local building department, because cities stack permit rules on top of the state license. [4][6]
I would not pay a salesperson who promises a Colorado backflow license. Ask which number they are actually getting you. An ASSE 5110 class is real. A secret state tester permit is not.
How does backflow tester renewal actually work in Colorado?
You recertify the tester card with the body that issued it, you refresh each utility's tester file, and you renew a Colorado plumber license only if you hold one. There is no single state tester renewal form. CDPHE does not process tester renewals at all. [2][5]
Those three clocks do not line up. The certifier prints an expiration on your card. The water supplier often wants an annual packet: new card copy, gauge calibration, sometimes insurance. DPO runs its own plumber cycle if you carry that license. Miss one clock and a district can idle you even when the other paper is current. [5][7]
The Safe Drinking Water Act is why the supplier cares. Federal law names the regulated party this way: "The term 'public water system' means a system for the provision to the public of water for human consumption through pipes or other constructed conveyances, if such system has at least fifteen service connections or regularly serves at least twenty-five individuals." [10] You are not that system. You are the person the system hired to test devices.
EPA's 2003 Cross-Connection Control Manual (EPA 816-R-03-002) recommends testing backflow prevention assemblies at least annually. [1] Colorado's Regulation 11 program follows that annual testing model for suppliers. Your personal credential lasts longer than the assemblies you test. The work tickets do not. [2][3]
I renew the cert early and I keep a one-page cheat sheet per utility. Portal login. CCC coordinator email. Whether they want a PDF or their own software. That sheet saves more jobs than a new gauge ever will.
How often do you recertify as a Colorado backflow tester?
Most tester cards run on the certifier's cycle, commonly three years for ASSE and ABPA programs. Colorado does not set that number in a tester license statute, because no such statute exists. Your card face is the date that counts. Utility rosters often refresh every year. [9]
ASSE professional tester credentials carry a fixed term set by the certifying body. ABPA runs its own term. If a school tells you Colorado law is "always three years," ask them to show the statute. They will not find a tester-license section. They will find Regulation 11 language that tells the supplier to use a certified technician. [3][9]
The assembly clock is shorter. Public water systems under Regulation 11 need assemblies tested on the interval in their written program, and that program is built around at least annual tests. [1][2] You can hold a valid three-year card and still lose a district over a stale gauge sheet or a missed annual roster update.
I recertify in the last third of the card, not the last week. Schools fill up in spring along the Front Range. Wait until the week the card dies and you will turn down work while you sit in class. That is a self-inflicted dry spell, not a state delay.
Write the expiration on the lid of the gauge case. You will ignore a calendar reminder. You will see the lid every job.
How much does backflow tester cost in Colorado?
There is no official statewide price for a backflow tester in Colorado. Initial classes often land in the mid hundreds to around a thousand dollars depending on the school. Recert classes cost less. State plumbing fees, if you need that license, are posted by DPO and change. Confirm them there. [5][9]
Nobody publishes an honest statewide fee schedule for tester work, because the state is not the vendor. Schools set tuition. Cert bodies set exam and recert fees. Water districts set (or waive) tester-list fees. Calibration labs set bench fees. I will not invent a current DPO plumber fee or a Denver Water roster fee here. Those numbers move, and a stale number in an article is how people bounce checks. [5][7]
A used differential gauge runs a few hundred dollars. A new kit with fittings can pass a thousand. That is a tool cost, not a license cost. I would buy one decent gauge and a current calibration before I bought a second brand of tester card. Dual logos rarely open districts that a current ASSE or ABPA card plus a phone call would not open. [9]
First year is the expensive year if you start from zero: class, exam, gauge, fittings, maybe a plumber application. A renewal year is class plus calibration plus whatever tiny roster fee a district still charges. If someone quotes you a four-figure "Colorado renewal package," ask for the line items. Much of that quote is markup on things you can file yourself.
Confirm every dollar with the school invoice, the cert body, DPO's current fee listing, and the utility contractor page. If a number is not on one of those four pieces of paper, treat it as optional.
How long does backflow tester take in Colorado?
A recert class is often one or two days plus exam time. Initial tester training is usually a full week of class and practical work. Utility registration can be quick or it can sit in someone's inbox for weeks. Nobody has honest statewide processing data. Confirm with the school and the supplier. [7][9]
I will not give you a guaranteed turnaround. ASSEPath is not the board, and the board is not even in this business for testers. Schools publish their own class hours. Cert bodies publish their own exam windows. A special district with one CCC person on vacation can sit on a roster update longer than a big utility with a portal. That is not a statute. That is staffing. [2][7]
If you also need the plumber path, stop thinking in days. C.R.S. Title 12, Article 155 is a trade license with education and experience rules, not a weekend add-on. DPO posts applications and, in renewal season, renewal instructions. Read those pages for the current cycle. Do not trust a blog's memory of last year's due date. [4][5][6]
Plan backward from the printed expiration. Book the recert seat first. Sit the exam. Hold the new card in your hand. Then blast copies to every district you still want. Doing the district emails first, while the old card is already dead, is how you open a gap in your own season.
Which certifications does Colorado actually accept?
Colorado water suppliers accept tester certifications from programs recognized under the Regulation 11 cross-connection framework. In practice that means ASSE, ABPA, and other established programs tied to the major water works groups. The supplier, not you, has to defend that choice to CDPHE. [2][3][9]
CDPHE's cross-connection pages and Regulation 11 are written for the public water system. They tell the system to use a certified cross-connection control technician. They do not hand you a state exam. ASSE's professional qualifications path (the 5110 tester track most schools sell) is the card Front Range coordinators see every week. ABPA is the other card they see every week. [2][9]
A tiny district may still have a sentence in an old ordinance that names one body only. Call before you argue. I have watched testers lose a week fighting for a logo when a one-day recert in the named program would have fixed it. Pride is a terrible billing code.
Hold an out-of-state tester card? Do not assume Colorado "reciprocity." There is no tester compact. Ask the supplier whether they recognize that certifier. If they do not, take the class they will accept. That is cheaper than writing appeal letters to a town clerk who does not control Regulation 11. [2][3]
Do you need a Colorado plumbing license to test backflow?
Testing only is treated as a certification-and-roster problem, not a DPO plumber-license problem, in a lot of Colorado towns. Installing or repairing the assembly is plumbing work under C.R.S. Title 12, Article 155. Confirm both with DPO and the local building department before you bid a rebuild. [4][6]
The Plumbing Board does not certify backflow testers. It licenses plumbers. Those are different jobs that sometimes share a truck. DPO's Plumbing Applications and Laws pages are where plumber paper actually lives. If a class catalog blurs the two, that is marketing. [5][6]
Local practice still bites. A city inspector can decide that pulling a relief valve or changing a test cock counts as repair. A water district can refuse a test from anyone off its list, license or not. I treat "test only" as test only. The minute a customer asks me to swap the assembly, I check the plumber license and the permit counter. Guessing is how you earn a stop-work sticker.
If you are not a plumber and you want to stay a tester, write that limit into the quote. "Test and report. No repair." Customers hear what they want unless you write it down.
What paper do water suppliers ask for at renewal?
Expect a current certification card, a recent gauge calibration sheet, and whatever portal login that district runs. Some utilities want a W-9 or a liability certificate. Denver Water publishes contractor backflow rules for its service area. Smaller districts often copy that pattern with less software. [7]
Denver Water's backflow contractor page is the cleanest public example on the Front Range. Read it even if you never work in Denver. Lots of special districts borrowed that checklist and never wrote their own. Fort Collins and other municipal utilities post their own customer and contractor notes. The details differ. The idea does not. [7][2]
Keep a folder per supplier. Card PDF. Calibration PDF. Insurance PDF if they asked last year. The email where they said you were approved. When a coordinator turns over, that folder is the only memory the district has of you.
I do not pay for fancy reporting subscriptions until a district requires that software. Emailing a PDF still works in more places than vendors admit. If you want a paper kit that maps ASSE 5110 and 5115 style forms so calibration sheets stop disappearing in the truck, ASSEPath sells a $149 one-time Tester Kit. It is not a Colorado credential and it will not get you on a roster.
Illinois utilities do not set Colorado paper, but the habit is the same. Compare the folder idea with how Illinois testers handle renewal if you also chase Midwest work.
What happens if your tester certification lapses?
If the card expires, stop testing. Suppliers can reject reports signed after the expiration date, and you can put the water system out of compliance on its annual tests. Recertify first, then send the new card to every district on your list. Do not backdate tickets. [1][2][7]
A lapsed card does not usually erase last year's accepted reports. It kills new ones. The ugly case is the test you already field-completed on Tuesday when the card died Monday and you did not notice. Void it. Retest after the new card is in hand. A forged date helps no one when the supplier gets audited.
Some schools let you sit recert a window before expiration. Use that window. Walking into a district office with a receipt and a promise is not a certification. Coordinators have heard the promise a hundred times.
If you let a card die for a long stretch, ask the cert body whether you recertify or start over. That rule belongs to ASSE or ABPA, not to Colorado. Alaska's lapse mess is not Colorado's, but the same advice holds on Alaska tester renewal: do not test on a dead card. [9]
How do you stay on a utility tester list after you recertify?
Send the new card and the new calibration sheet the week you get them. Ask the CCC coordinator whether you are still on the active list. Some portals drop testers who go quiet. A phone call beats assuming last year's login still works. [7]
Big systems lean on software. Small systems lean on a spreadsheet in one person's office. Both fail the same way. Your email bounced, or you changed phones, or they rebuilt the list in January while you were not looking. I send a short note every time the card or the gauge sheet changes. Two attachments. One sentence. No novel.
When a district goes silent, stop guessing and call the water department's cross-connection number. Denver Water puts contractor information on its backflow page. Other suppliers bury the coordinator under "backflow" or "cross connection" on the utilities site. Keep digging until a human answers. [7][2]
Do not wait for a rejected test to learn you were removed. That rejection lands on the customer's deadline, which is how you earn a furious property manager and a competitor on the next ticket.
What should you budget in a renewal year?
Budget the recert class, the exam fee if it is separate, gauge calibration, and any utility registration fee the district actually charges. Skip a second brand of tester card unless a specific supplier demands that logo. Confirm every number before you pay. Fees move. [5][9]
| What repeats | Who owns it | Typical interval | Confirm with |
|---|---|---|---|
| Tester certification | ASSE, ABPA, or other cert body | Printed expiration (often 3 years) | The card and the certifier |
| Utility tester roster | Each public water supplier | Often annual | The CCC coordinator |
| Assembly test | Water supplier / Regulation 11 program | At least annual | The supplier's CCC plan |
| Gauge calibration | You and the cal lab | Commonly 12 months | The supplier's tester packet |
| Plumber license | DPO State Plumbing Board | DPO's posted cycle | DPO Plumbing Applications |
That table is a checklist, not a fee schedule. I left the money column blank on purpose. Schools and DPO change prices. An article that pretends otherwise is lying to you. [1][5][7]
Waste of money, in my view: a second full tester certification you will never show, a vinyl wrap on the truck before you have three districts, and any "expedite" service that cannot name the office it is expediting. Spend it on calibration and on getting to class before the card dies.
Florida's fee culture is not Colorado's. If you winter there, read Florida backflow tester renewal instead of copying this budget.
How is Colorado different from other states?
Colorado is a supplier-driven state, not a state-license state. That is different from places that put testers on a state roster and cash a renewal check. If you also work across the line, read that state's path instead of assuming your Colorado folder travels. Rules do not copy cleanly. [2][3]
Here the drinking water rule sits on the public water system through Regulation 11, with federal backing from the Safe Drinking Water Act. Testers are qualified vendors. In some other states a health department or a plumbing board keeps a tester list and bills you directly. Do not import that mental model. You will wait for a letter from Denver that is not coming. [3][10][11]
Arizona tester renewal and Idaho tester renewal are the comparisons I would actually open if I lived on those borders. California tester renewal is a heavier local-agency stack. Georgia and Hawaii do not share Colorado's paperwork, even when the ASSE card looks the same.
The part that does travel is the habit. Keep the card current. Keep the gauge honest. Keep each water system in the loop. That habit works in every state I have read. The forms do not.
Where do you confirm the current rule before you pay anyone?
Confirm Regulation 11 with the Water Quality Control Commission text, confirm plumbing issues with DPO, and confirm tester-file rules with the water supplier that owns the service connection. If those three disagree, the supplier's written CCC program is what accepts or rejects your test today. [3][5][6][7]
Start with CDPHE's cross-connection control program page and the current Regulation 11 text. Then open DPO's Plumbing Applications and Laws pages if repair work is in play. Then open the utility contractor page for each town you bill. Denver Water is public and specific. Smaller districts may only answer the phone. Call them anyway. [2][3][5][7]
I do not trust a class brochure as a legal source. I do not trust this article as a substitute for the current PDF either. Rules get amended. Fees get revised. Coordinators get new software. Read the primary page the week you spend the money.
ASSEPath is an independent publisher, not a law firm and not a service company. No approval, quota, or timing promise lives here. If you want the paper kit after you hold the real credentials, it is at /start. Confirm every current fee with the cert body, DPO, and the water supplier before you pay anyone.
Frequently asked questions
Do you need a license for backflow tester in Colorado?
No statewide tester license exists. You need a CDPHE-recognized third-party certification (commonly ASSE or ABPA) and a spot on each water supplier's tester list. A Colorado plumbing license is separate paper through DPO, and it matters when you install or repair assemblies. Confirm both with DPO and the utility before you bid.
How much does backflow tester cost in Colorado?
There is no official state price. Initial classes often run from the mid hundreds to around a thousand dollars, set by the school. Recert is less. Gauge, calibration, and any utility roster fee sit on top. DPO plumber fees, if you need that license, are posted by the board and change. Confirm every figure on the current invoice or fee page.
How long does backflow tester take in Colorado?
Recert is often one or two class days plus the exam. Initial tester training is usually about a week. Utility roster updates range from same week to however long that coordinator's inbox sits. Nobody publishes honest statewide processing times. Book class from the date on your card, not from a blog estimate.
Is ASSE 5110 enough to test in Denver?
A current ASSE tester card is the credential Denver-area coordinators see most. Denver Water still runs its own contractor backflow process, so the card alone is not a roster slot. Read Denver Water's backflow contractor page, send the card and calibration sheet they ask for, and confirm you are on the active list before you schedule tests.
Does a lapsed cert void last year's tests?
Usually no. Accepted reports from when the card was valid typically stay in the supplier's file. New tests signed after expiration are the problem. Stop testing, recertify, then retest anything you field-completed on a dead card. Do not backdate. Confirm with the supplier how they want a voided ticket handled.
Can you test statewide with one card?
The certification card can travel. The permission to file a test does not. Each public water supplier keeps its own tester list under its Regulation 11 program. You can hold one ASSE or ABPA card and still need a separate roster step in Denver, a Springs suburb, and a mountain district. Ask each CCC coordinator.
Do you need CE hours besides the recert class?
Colorado does not run a state tester CE ledger. Your cert body sets what counts as recertification, often a recert class and exam. A water supplier can add its own workshop. A plumber license, if you hold one, follows DPO's rules, not the tester card. Read the card, the certifier, and DPO separately.
Who calibrates the gauge in Colorado?
You pick a competent calibration lab. The state does not run a tester-gauge bureau. Most utilities want a sheet dated within about a year, but that interval is the supplier's packet rule, not a single statute. Ask the district what date window they accept before you mail the gauge out.
Can an apprentice test assemblies?
The person who signs the test needs the tester certification the supplier recognizes. An apprentice without that card should not be the signer. Plumbing apprenticeships live under DPO and do not replace ASSE or ABPA. If a shop sends an uncertified helper to run the gauge, the report is the thing that will bounce.
Does Colorado reciprocity exist for out-of-state testers?
Not as a state tester compact. A supplier may accept your existing certifier if that program is already in their CCC plan. If they do not recognize the logo, you take a class they will accept. Do not wait on a reciprocity letter from CDPHE. CDPHE is not licensing testers.
When should you start the recert process?
Start when you still have a comfortable buffer on the printed expiration, often a few months out. Front Range seats fill. I would rather recertify early than turn down May irrigation tests because a Saturday class was full. Confirm the school's next date as soon as the current card is in your wallet.
Is the plumbing board the backflow board?
No. The State Plumbing Board at DPO licenses plumbers under C.R.S. Title 12, Article 155. Cross-connection rules for public water systems sit in Regulation 11 and with CDPHE. Tester cards come from private certifiers. Three desks. Three phone numbers. Mix them up and you will mail the wrong form.
Do you need insurance to renew?
Colorado does not attach a state tester-insurance mandate to a license that does not exist. Individual water suppliers sometimes ask for a liability certificate before they add you to a roster. Ask that district. If they do not ask, do not buy a policy just because a class upsell said you must.
What if the water district has its own test form?
Use their form. Regulation 11 puts the program on the supplier, so their template is what their file can defend. Your favorite spreadsheet is fine as a field note. It is not fine as the official submittal if they told you otherwise. Ask whether they want paper, email, or a portal before test day.
Sources
- U.S. EPA Cross-Connection Control Manual (EPA 816-R-03-002): Federal manual defining backflow and recommending that backflow prevention assemblies be tested at least annually
- CDPHE Cross-Connection Control program: Colorado drinking water suppliers must run a cross-connection control program and use certified technicians
- CDPHE Water Quality Control Commission regulations (Regulation 11): 5 CCR 1002-11 (Regulation 11) is Colorado's Primary Drinking Water Regulations, including cross-connection control
- Colorado Revised Statutes 2023 Title 12 (Article 155 Plumbers): C.R.S. Title 12, Article 155 is the state plumbing license statute
- Colorado DPO State Plumbing Board Applications: Plumber applications and renewals are filed with the State Plumbing Board at DPO, not a backflow-specific board
- Colorado DPO State Plumbing Board Laws, Rules and Policies: Plumbing Board laws, rules, and policies are posted on the DPO Plumbing Laws page
- American Backflow Prevention Association Certification: ABPA offers a backflow tester certification that Colorado water systems commonly accept
- U.S. Code Title 42 Chapter 6A Subchapter XII (Safe Drinking Water Act): Federal law defines public water systems (15 connections or 25 people) as the regulated drinking-water entities
- U.S. EPA Title XIV Safe Drinking Water Act page: The Safe Drinking Water Act is the federal backbone for state primacy drinking water rules including Colorado Regulation 11
- Colorado Secretary of State Code of Colorado Regulations (eCCR): Official eCCR listing for Water Quality Control Commission rules, including 5 CCR 1002-11