How we research
Backflow Tester List is published by Directory Assistance Group, an independent publisher of reference directories built from public records. This page explains where our information comes from, how pages are put together, and how we keep them current.
Sources
We use state drinking-water and environmental agency pages, statutes and rules those pages cite, and EPA materials on primacy and cross-connection control. A private certifier is named only when the state page says it accepts that certifier.
The state pages repeat the verified state fields. They do not include a water utility's extra registration list.
The official sources behind each state page
These are the agencies, statutes and official pages we cite for Backflow Tester List, listed by state. A linked state name opens the page that cites those sources. A name that is not a link does not have a searchable guide.
Alabama: ADEM Division 7 water-supply rules; ADEM drinking water design guidance; EPA primacy page.
Alaska: 18 AAC 80 drinking water; How to prepare for a sanitary survey; EPA primacy page.
Arizona: ADEQ Backflow Prevention; EPA Cross-Connection Control Manual; EPA primacy page.
Arkansas: ADH Cross Connection/Backflow Prevention; 17 CAR 66-102 qualifications; ADH accredited training programs.
California: Backflow tester and specialist certification; EPA Cross-Connection Control Manual; EPA primacy page.
Colorado: CDPHE backflow prevention and cross-connection control; Policy 7 backflow rule policy; BPCCC rulemaking contact page.
Connecticut: DPH backflow prevention and cross connection control; DWBT initial application instructions; Connecticut eLicense lookup.
Delaware: Office of Drinking Water cross-connection guidance; Delaware Code title 16, section 7910; 16 DE Admin. Code 4462.
District of Columbia: EPA report to Congress on community water system compliance; EPA primacy page; EPA Cross-Connection Control Manual.
Florida: DEP cross-connection control and backflow prevention; Community drinking water system requirements; Cross-connection control program annual report.
Georgia: Georgia EPD drinking water documents; GBPAT guidance, September 1, 2021; EPD capacity development report.
Hawaii: Safe Drinking Water Branch; Title 11 rules index; Significant deficiency fact sheet.
Idaho: Idaho Code Title 54, Chapter 24; IDAPA 24.05.01; DOPL backflow tester course guidelines.
Illinois: Illinois EPA cross connection control; Pollution Control Board CCCDI opinion; EPA primacy page.
Indiana: IDEM cross-connection manual page; IDEM cross-connection manual PDF; IDEM livestock backflow fact sheet.
Iowa: DIAL backflow prevention assembly tester registration; Iowa Code chapter 135K; 481 IAC 476.
Kansas: Kansas statutes on public water supplies; KDHE proposed-project regulatory letter; KDHE point-of-use and point-of-entry policy.
Kentucky: 401 KAR 8:020; 401 KAR 8:010 definitions; 815 KAR 20:120.
Louisiana: LDH Bureau of Engineering Services; Cross-connection final rule; Approved general testers.
Maine: Maine CDC treatment and cross connections; Drinking water statutes and rules; Rules relating to drinking water.
Maryland: COMAR 09.20.04.02; COMAR 09.20.04.01; Board of Plumbers approved backflow courses.
Massachusetts: WS 10 cross connection certification; 310 CMR 22.22; Public drinking water system operations.
Michigan: EGLE cross connection control; Backflow tester credentials FAQ; LARA and EGLE joint interpretive statement.
Minnesota: MDH responsible authorities; High-hazard cross connections in Minnesota; Backflow prevention devices fact sheet.
Mississippi: Mississippi drinking water regulations; Mississippi Safe Drinking Water Act compilation; EPA Cross-Connection Control Manual.
Missouri: DNR backflow prevention; Certified assembly testers; 10 CSR 60-11.
Montana: Montana DEQ drinking water rules; EPA Cross-Connection Control Manual; Circular DEQ-3.
Nebraska: Title 179 complete regulations; Title 179, chapter 22, 2004 pamphlet; EPA primacy page.
Nevada: NDEP March 2024 cross-connection guidance; NDEP approved cross-connection regulations; NDEP drinking water operator certification.
New Hampshire: RSA 485:11; DES model cross-connection program; DES testing-company fact sheet.
New Jersey: DEP certified backflow testers; Physical connection permitting overview; E-permitting FAQ.
New Mexico: Ground Water Rule significant-deficiency policy; Surface Water Rule significant-deficiency policy; EPA primacy page.
New York: Backflow tester certification instructions; Backflow testing FAQ; 10 NYCRR 5-1.31.
North Carolina: 15A NCAC 18C .0400 design criteria; Operator certification rules; Drinking water operator certification staff.
North Dakota: NDDEQ backflow prevention and cross connection control; EPA Cross-Connection Control Manual; EPA primacy page.
Ohio: Ohio Revised Code 3703.21; Rule 1301:3-7-04, backflow fees; Rule 1301:3-7-05, backflow renewal; Ohio Administrative Code 1301:3-7-02.
Oklahoma: OAC 252:631 public water supply operation; OAC 252:626 construction standards; EPA primacy page.
Oregon: OHA tester and specialist certification; EPA Cross-Connection Control Manual; EPA primacy page.
Pennsylvania: DEP Public Water Supply Manual, Part VII; EPA primacy page; EPA Cross-Connection Control Manual.
Rhode Island: RIDOH cross-connection annual report form; Westerly backflow testing request; EPA primacy page.
South Carolina: SCDES cross connection control and backflow prevention; Recertification study guide; EPA primacy page.
South Dakota: South Dakota drinking water regulatory information; Adopted plumbing rules packet; EPA primacy page.
Tennessee: TDEC cross-connection control; Cross-connection basic workshop description; Fleming Training Center public portal.
Texas: TCEQ Backflow Prevention Assembly Tester license; EPA Cross-Connection Control Manual; EPA primacy page.
Utah: Utah cross connection control and backflow prevention; Backflow assembly tester certification; Cross-connection rule updates.
Vermont: Vermont Water Supply Rule; EPA Cross-Connection Control Manual; EPA primacy page.
Virginia: VDH cross connection control; 12VAC5-590 cross-connection text; 18VAC50-30-42.
Washington: Department of Health cross-connection control; WAC 246-292-034; Backflow assembly testing requirements.
West Virginia: Cross-connection control and backflow prevention rule; EPA Cross-Connection Control Manual; EPA primacy page.
Wisconsin: DSPS cross connection control assembly tester; DSPS profession list entry.
Wyoming: Chapter 12 adoption package; EPA report to Congress; EPA primacy page.
What we will not publish
We show a rule, fee, deadline, listing or figure only when an official or primary source publishes it, and we link that source. When a value says it is not published, it means we could not find an official source, not that no rule exists. We do not estimate numbers, invent statistics or quotes, or claim reviewers or credentials we do not have. We are not lawyers, engineers, doctors or government officials, and nothing here is legal, medical or professional advice.
Which pages we publish for search
Each state page is built from that state's own official sources and is offered to search engines only once those state-specific details are verified. Advice that applies everywhere lives once on this page and in our guides instead of being repeated on every state page.
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Corrections
Spotted an error or a change? Tell us, with a link to the official source if you can. We confirm it against that source before we change a page. See also the about page.