Community Water System · PWSID NN4903017

Red Mesa Ntua

Serves 1,023 peopleSurface Water PurchasedOwner: Native AmericanFt Defiance, Arizona
Nothing open that measures the water, but 4 open testing or paperwork violations.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2013: 22 violations. 6 over the limit · 6 missed or late tests · 10 notices or reports. Most recent began 2024-07-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

6Over the limit
0Treatment lapse
6Missed or late test
10Notice or report4 open

More violations on record than 67% of active water systems in Arizona. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102013 · Missed or late test: 12013 · Notice or report: 12014 · Notice or report: 32014 · Notice or report: 32014 · Notice or report: 32015 · Over the limit: 120152016 · Notice or report: 12017 · Over the limit: 12017 · Notice or report: 12018 · Missed or late test: 12019 · Missed or late test: 120202022 · Missed or late test: 12023 · Over the limit: 12023 · Notice or report: 12024 · Over the limit: 32024 · Over the limit: 32024 · Over the limit: 32024 · Missed or late test: 22024 · Missed or late test: 22024 · Notice or report: 32024 · Notice or report: 32024 · Notice or report: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
27% over the limit · 627% missed or late test · 645% notice or report · 10

Across Arizona, 65% of violations are missed or late tests and 5% are water over a limit.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 4 results on file · action level 15 ppb

below 1 ppb
1 ppb
1 ppb
below 1 ppb

Open now (4)

  1. 2024-07-01Public NoticePN Violation for NPDWR ViolationOpen
  2. 2024-04-01Public NoticePN Violation for NPDWR ViolationOpen
  3. 2024-01-01Public NoticePN Violation for NPDWR ViolationOpen
  4. 2023-10-01Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2024-07-01Public NoticePN Violation for NPDWR ViolationOpen
  2. 2024-07-01ArsenicMCL, Averagemeasured 0.0116 MG/LBack in compliance
  3. 2024-04-01Public NoticePN Violation for NPDWR ViolationOpen
  4. 2024-04-01ArsenicMCL, Averagemeasured 0.0131 MG/LBack in compliance
  5. 2024-01-01Public NoticePN Violation for NPDWR ViolationOpen
  6. 2024-01-01NitriteMonitoring, RegularPeriod ended · no return to compliance on file
  7. 2024-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  8. 2024-01-01ArsenicMCL, Averagemeasured 0.0132 MG/LBack in compliance
  9. 2023-10-01Public NoticePN Violation for NPDWR ViolationOpen
  10. 2023-10-01ArsenicMCL, Averagemeasured 0.0126 MG/LPeriod ended · no return to compliance on file
  11. 2022-01-01ArsenicMonitoring, RegularBack in compliance
  12. 2019-01-01ArsenicMonitoring, RegularBack in compliance
  13. 2018-01-01SodiumMonitoring, RegularBack in compliance
  14. 2017-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  15. 2017-01-01ArsenicMCL, Averagemeasured 0.0106 MG/LBack in compliance
  16. 2016-04-01Revised Total Coliform RuleOtherBack in compliance
  17. 2015-10-01ArsenicMCL, Averagemeasured 0.0105 MG/LBack in compliance
  18. 2014-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  19. 2014-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  20. 2014-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  21. 2013-10-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  22. 2013-10-01Dbp Stage 2Failure Submit IDSE/Subpart V Plan RptBack in compliance

System details

Population served1,023
Service connections299
Water sourceSurface Water Purchased
System typeCommunity Water System
OwnerNative American
StatusActive
CityFt Defiance
EPA ZIP on file86504

Areas served

  • Red Mesa

Reading this record

Red Mesa Ntua is a community water system that draws from surface water purchased and serves about 1,023 people in Ft Defiance, Arizona. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.