State rules
North Carolina
North Carolina’s public-water-supply design rules prohibit operating a physical arrangement whereby a public water system has a cross-connection without proper backflow protection. A supplier shall not provide a service connection to plumbing that does not comply with the North Carolina State Building Code, Volume II, and applicable local plumbing codes. Where required, the supplier installs or requires a testable backflow prevention assembly before making the connection. Design of that service assembly does not require Department review. Separately, the operator-certification rules create a Cross-Connection Control certificate for the operator in responsible charge when a system is required to have five or more testable assemblies. That certificate is an operator credential, not a private tester license.
Checked against official sources on October 11, 2026. Rules and links change; confirm with the office listed before you act.
- Drinking-water agency
- The North Carolina Department of Environmental Quality public-water-supply and operator-certification programs set cross-connection design and operator-certificate rules.
- Who may test an assembly
- The water system must use proper backflow protection. An operator Cross-Connection Control certificate is required for the person in charge when the system has five or more testable assemblies. A separate statewide private-tester license is not stated in these rules.
- Official program page
- Official page →
The design rule says testable backflow prevention assemblies that are not addressed by the plumbing code shall meet ASSE standards and carry an ASSE seal, be on the University of Southern California approval list, or be on the North Carolina State Plumbing Code approval list. For water-treatment hazards, the supplier provides the appropriate assembly or method in accordance with AWWA M14. Those sentences are about the assembly. They do not say an ASSE personal card is the state tester license. Connections the rule lists for Department review, including non-potable or unapproved connections, need an approved testable assembly or an air gap and engineering plans.
The operator rules say the Cross-Connection Control classification applies to any distribution system required to have five or more testable backflow prevention assemblies. There shall be an operator in responsible charge for those cross-connection facilities, and that operator shall possess a valid Cross-Connection Control certificate issued by the Board. The Department of Environmental Quality operator-certification staff page lists a specialist for cross-connection examinations. Experience for the grade is described as on-site cross-connection control duties for a public water system. A town water-system page can still keep its own list of testers the town will accept for customer assemblies.
A property owner should ask two questions: who holds the system’s Cross-Connection Control operator certificate, and who the water system allows to field-test the customer’s assembly. The state rules reviewed here answer the operator question directly when the system has five or more testable assemblies. They do not publish a private-tester roster or a test fee. Ask the supplier which person may sign the field report for your assembly.
Official resources in North Carolina
Prohibits unprotected cross-connections and sets approval routes for testable assemblies.
Requires a Cross-Connection Control certificate when a system has five or more testable assemblies.
Lists the staff contact for cross-connection examinations.
Key facts for North Carolina
- A public water system may not have a cross-connection without proper backflow protection.
- Service connections must comply with the State Building Code plumbing volume and local plumbing codes.
- Testable assemblies outside the plumbing-code path must meet ASSE seal requirements, the USC approval list, or the State Plumbing Code list.
- A system required to have five or more testable assemblies must have an operator in responsible charge with a Cross-Connection Control certificate.
- DEQ’s certification staff page assigns cross-connection examinations to a named specialist.
- The rules reviewed do not publish a statewide roster of private assembly testers.
What to do next
- Ask the water system whether it has five or more testable assemblies and who the certified operator is.
- Ask separately who may sign the field test on your assembly.
- Do not treat an ASSE product seal as a person’s license.
- Use the DEQ staff page for questions about the operator exam, not for hiring a tester.
Looking for your city or county in North Carolina?
We haven't found official program-level pages for North Carolina we can verify yet, so we don't show local numbers here rather than guess. Here's what to use instead, in order:
- General Start with the statewide information above. It applies across North Carolina, but cities and counties can add their own steps, fees or deadlines.
- Call to confirm Ask the official office. They have the current local rule, fee and form.NC DEQ drinking water operator certification
Website →Phone not shown: use the contact page on the official website above.Your city or county office: Local governments →Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the North Carolina page on USA.gov can point you to the right office. - Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.
Helpful guides
- What a backflow test is
- Who is allowed to test a backflow assembly
- Why utilities require annual backflow testing
- Tester and cross-connection specialist