Not applicable in drinking water
79 active public water systems in 4 states had a Not applicable violation in the past three years, and 71 have one that is still unresolved.
You are on Tapcensus, an independent guide to the EPA compliance records of every public water system in the United States. This page explains Not applicable and lists the water systems whose records include a related violation. It does not show measured levels.
Is Not applicable in the records for your water system?
Enter a ZIP code, town, or street address to see the water systems that serve your area, their status, and which rules and contaminants appear in their violations.
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The standard and what a violation means
Water systems with a Not applicable violation, by state
Active public water systems that reported at least one related violation to EPA in the past three years. Each state links to the list of its affected systems.
| State | Systems with violations, 3 yr | Share of active systems | Unresolved |
|---|---|---|---|
| Alaska | 66 | 5% | 66 |
| California | 9 | 0% | 3 |
| New Mexico | 3 | 0% | 2 |
| Iowa | 1 | 0% | 0 |
Largest water systems with a Not applicable violation
The ten biggest systems, by people served, whose records include a related violation in the past three years.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Denali Main / Front Country Denali Park · Denali Borough County |
4,122 | 7 | 1 | |
|
City of Hooper Bay Hooper Bay · County |
1,375 | 10 | 4 | |
|
Pioneer Wells at Fox Fairbanks · Fairbanks North Star Borough County |
880 | 1 | 1 | |
|
Descanso Community Water District San Diego County |
870 | 3 | 1 | |
|
Msbsd Redington Jr/sr High School Wasilla · Matanuska-Susitna Borough County |
550 | 1 | 1 | |
|
White Raven, Llc. Dba: the Park Mart Denali Park · Denali Borough County |
516 | 2 | 1 | |
|
Tok Civic Center Tok · Southeast Fairbanks Census Area County |
500 | 1 | 1 | |
|
Nunapitchuk Water System Nunapitchuk · Bethel Census Area County |
496 | 6 | 1 | |
|
St. Michael Water System Saint Michael · Nome Census Area County |
495 | 6 | 1 | |
|
Poachers Cove Planned Unit Development Soldotna · Kenai Peninsula Borough County |
400 | 2 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Not applicable, including monitoring and reporting lapses. Rules violated and status in the systems table are for the whole system, not Not applicable alone. Counts cover active systems in all 50 states and the District of Columbia.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.