Water purveyor
A water purveyor means the utility or organization that owns and operates a public water system and supplies drinking water to customers: a city water department, a water district, a private water company or a similar supplier. In backflow prevention the purveyor is the authority that runs the cross-connection control program, decides which assemblies are required at the service connection and which testers it recognizes.
Updated 2026 · Researched from published standards, not professional or legal advice.
Water purveyor at a glance
| Question | Answer |
|---|---|
| Meaning | The entity that owns, operates and supplies a public drinking water system |
| Examples | Municipal water department, water district, private water company, mutual water company |
| Role in backflow prevention | Runs the cross-connection control program; requires, tracks and enforces assembly testing |
| Relationship to testers | Recognizes tester credentials, receives test reports, sets the testing cycle |
| Relationship to property owners | Requires containment protection at the service connection and notifies when tests are due |
A water purveyor is the entity that supplies potable water to customers through a distribution system: a municipal utility, a water district, a private water company, or a similar organization. The purveyor treats or sources the water, maintains the mains and service connections, and delivers water to the property line or meter. Along with that role comes a legal and practical responsibility to protect the quality of the water inside its distribution system.
In cross-connection control, the purveyor is usually the driving authority. Because it cannot control what customers connect inside their buildings, it protects the public system by requiring containment assemblies at services that present a hazard, keeping an inventory of those assemblies, setting testing requirements, and receiving test reports. The purveyor also typically decides hazard classifications and can deny or discontinue service to a property that refuses to install or maintain required protection.
Testers and property owners interact with the purveyor constantly, even when they do not realize it. Test reports are usually filed with the purveyor, notification letters about due dates come from it, and questions about which assembly a property needs are ultimately its call. Testers should learn each local purveyor's reporting process and forms, and owners should keep the purveyor informed when property use changes, since that can change the required level of protection.
Common questions
What does water purveyor mean?
A water purveyor is whoever supplies the public drinking water: the utility that owns the mains, treats or buys the water, and delivers it to the meter. The word purveyor simply means supplier. Regulations use it because the supplier, not the plumbing code, is responsible for the quality of water in the distribution system.
Is the water purveyor the same as the water authority?
Often, but not always. The purveyor is the supplier of the water. The authority on backflow may be the purveyor, the state drinking water program, the local plumbing authority, or all three with different roles. Testers should confirm which body recognizes their certification and which receives test reports.
Sources
- AWWA Manual M14, Backflow Prevention and Cross-Connection Control: Recommended Practices: purveyor program responsibilities and containment practice.
- U.S. EPA, Cross-Connection Control Manual (Office of Water): definitions of backflow, backsiphonage, backpressure and the assembly types.
Related terms
| Cross-connection control program | The organized system of surveys, device requirements, testing, and recordkeeping through which a water purveyor or authority manages backflow risks. |
| Containment vs. isolation | Two complementary protection strategies: containment protects the public main at the service connection, while isolation protects users inside the building at each hazard. |
| Annual testing | The periodic field testing of backflow prevention assemblies, typically annual where required, set by the water authority, that verifies each assembly still works. |
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