Backflow Tester List

State rules

Oklahoma

Oklahoma’s Department of Environmental Quality public-water-supply operation rule, OAC 252:631-3-17, says a public water system must not allow a physical connection between a line carrying a public drinking-water supply and a line carrying water of unknown or questionable quality. It must not allow a connection to any device or system that poses a health threat unless there is an air gap of at least six inches or two pipe diameters, whichever is larger, above the overflow or drain. A reduced-pressure-zone backflow prevention device will be considered in lieu of an air gap. The design must include a diversion line with equal backflow prevention so the device can be maintained. The rule does not create a state tester license.

Checked against official sources on October 11, 2026. Rules and links change; confirm with the office listed before you act.

Try a ZIP like 30303, “Travis County” or “Columbus, OH”
Drinking-water agency
The Oklahoma Department of Environmental Quality public-water-supply rules prohibit unprotected cross-connections.
Who may test an assembly
The operation rule does not issue a tester license. The public water system enforces the connection limits.
Official program page
Official page →

The same section says not to locate a backflow device in a pit or vault where it can become submerged. A fire suppression system is not considered a hazardous water supply. The rule forbids a cross-connection between a public water system and any private water system, and it requires an air gap where finished water meets a drain. Construction standards in OAC 252:626 repeat the air-gap and reduced-pressure approach and require protection on chemical-feed service water.

Those rules tell the public water system what connections it may allow and how protection is built. They do not name a tester examination, a roster, or ASSE, ABPA, or AWWA as a personal credential. A customer who is told to test a reduced-pressure-zone device should ask the water system who may perform that test and who signs the record. The fire-suppression sentence means the rule does not treat a fire system, by itself, as a hazardous water supply. It does not say fire lines never have backflow assemblies.

No fee is stated in the sections used here. The public water system enforces the connection limits, so ask that system who may test a reduced-pressure-zone device and who keeps the record. Private wells stay off the public main. The fire-system sentence does not say fire lines are free of every assembly. It says a fire system is not, by itself, a hazardous water supply under OAC 252:631-3-17.

Official resources in Oklahoma

OAC 252:631 public water supply operation

Section 252:631-3-17 limits physical connections and describes the air gap or reduced-pressure-zone alternative.

OAC 252:626 construction standards

Construction rules on cross-connections, pits, and chemical-feed air gaps.

EPA primacy page

Federal context for state public-water-system programs.

Key facts for Oklahoma

What to do next

  1. Ask the water system who may test a reduced-pressure-zone device; this rule does not license testers.
  2. Do not plan a pit installation; the rule bars devices that can become submerged.
  3. Keep private-well piping off the public system.
  4. Ask before assuming a fire line is exempt from every backflow assembly; the rule only says it is not, by itself, a hazardous supply.

Looking for your city or county in Oklahoma?

We haven't found official program-level pages for Oklahoma we can verify yet, so we don't show local numbers here rather than guess. Here's what to use instead, in order:

  1. General Start with the statewide information above. It applies across Oklahoma, but cities and counties can add their own steps, fees or deadlines.
  2. Call to confirm Ask the official office. They have the current local rule, fee and form.
    Oklahoma DEQ public water supply operation rules
    Website →
    Phone not shown: use the contact page on the official website above.
    Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Oklahoma page on USA.gov can point you to the right office.
  3. Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.

Helpful guides

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