Community Water System · PWSID NN3503028

Toadlena Ntua

Serves 903 peopleGroundwaterOwner: Native AmericanFt Defiance, Arizona
Nothing open that measures the water, but 2 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: 59 violations. 39 over the limit · 8 missed or late tests · 12 notices or reports. Most recent began 2025-07-01.

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

39Over the limit
0Treatment lapse
8Missed or late test
12Notice or report2 open

More violations on record than 89% 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: 12014 · Notice or report: 12015 · Notice or report: 120152016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42016 · Notice or report: 12017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Notice or report: 12018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Notice or report: 12019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Missed or late test: 32019 · Missed or late test: 32019 · Missed or late test: 32020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Missed or late test: 22020 · Missed or late test: 22020 · Notice or report: 120202021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Notice or report: 12022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Missed or late test: 22022 · Missed or late test: 22022 · Notice or report: 12023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Notice or report: 32024 · Notice or report: 32024 · Notice or report: 32025 · Over the limit: 32025 · Over the limit: 32025 · Over the limit: 32025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
66% over the limit · 3914% missed or late test · 820% notice or report · 12

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

2 ppb
1 ppb
below 1 ppb
below 1 ppb

Open now (2)

  1. 2025-04-01Public NoticePN Violation for NPDWR ViolationOpen
  2. 2024-10-01Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-07-01ArsenicMCL, Averagemeasured 0.0127 MG/LPeriod ended · no return to compliance on file
  2. 2025-04-01Public NoticePN Violation for NPDWR ViolationOpen
  3. 2025-04-01ArsenicMCL, Averagemeasured 0.0117 MG/LPeriod ended · no return to compliance on file
  4. 2025-01-01ArsenicMCL, Averagemeasured 0.0126 MG/LPeriod ended · no return to compliance on file
  5. 2024-10-01Public NoticePN Violation for NPDWR ViolationOpen
  6. 2024-10-01ArsenicMCL, Averagemeasured 0.0127 MG/LPeriod ended · no return to compliance on file
  7. 2024-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  8. 2024-07-01ArsenicMCL, Averagemeasured 0.0136 MG/LPeriod ended · no return to compliance on file
  9. 2024-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  10. 2024-04-01ArsenicMCL, Averagemeasured 0.0149 MG/LPeriod ended · no return to compliance on file
  11. 2024-01-01ArsenicMCL, Averagemeasured 0.0143 MG/LPeriod ended · no return to compliance on file
  12. 2023-10-01ArsenicMCL, Averagemeasured 0.0151 MG/LPeriod ended · no return to compliance on file
  13. 2023-07-01ArsenicMCL, Averagemeasured 0.0145 MG/LPeriod ended · no return to compliance on file
  14. 2023-04-01ArsenicMCL, Averagemeasured 0.0135 MG/LPeriod ended · no return to compliance on file
  15. 2023-01-01ArsenicMCL, Averagemeasured 0.0133 MG/LPeriod ended · no return to compliance on file
  16. 2022-10-01ArsenicMCL, Averagemeasured 0.0128 MG/LPeriod ended · no return to compliance on file
  17. 2022-07-01ArsenicMCL, Averagemeasured 0.0115 MG/LPeriod ended · no return to compliance on file
  18. 2022-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  19. 2022-04-01ArsenicMCL, Averagemeasured 0.0119 MG/LPeriod ended · no return to compliance on file
  20. 2022-01-01SodiumMonitoring, RegularPeriod ended · no return to compliance on file
  21. 2022-01-01ArsenicMonitoring, RegularBack in compliance
  22. 2022-01-01ArsenicMCL, Averagemeasured 0.0135 MG/LPeriod ended · no return to compliance on file
  23. 2021-10-01ArsenicMCL, Averagemeasured 0.0157 MG/LPeriod ended · no return to compliance on file
  24. 2021-07-01ArsenicMCL, Averagemeasured 0.0175 MG/LPeriod ended · no return to compliance on file
  25. 2021-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
Show the other 34 entries
  1. 2021-04-01ArsenicMCL, Averagemeasured 0.0178 MG/LPeriod ended · no return to compliance on file
  2. 2021-01-01ArsenicMCL, Averagemeasured 0.0177 MG/LPeriod ended · no return to compliance on file
  3. 2020-10-01ArsenicMCL, Averagemeasured 0.0156 MG/LPeriod ended · no return to compliance on file
  4. 2020-07-01ArsenicMCL, Averagemeasured 0.0146 MG/LPeriod ended · no return to compliance on file
  5. 2020-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2020-04-01ArsenicMCL, Averagemeasured 0.0149 MG/LPeriod ended · no return to compliance on file
  7. 2020-01-01Trihalomethanes (TTHM)Monitoring, Routine (IDSE)Back in compliance
  8. 2020-01-01Total Haloacetic Acids (HAA5)Monitoring, Routine (IDSE)Back in compliance
  9. 2020-01-01ArsenicMCL, Averagemeasured 0.0149 MG/LPeriod ended · no return to compliance on file
  10. 2019-10-01ArsenicMCL, Averagemeasured 0.0148 MG/LPeriod ended · no return to compliance on file
  11. 2019-07-01ArsenicMonitoring, RegularBack in compliance
  12. 2019-07-01ArsenicMCL, Averagemeasured 0.0153 MG/LPeriod ended · no return to compliance on file
  13. 2019-04-01ArsenicMonitoring, RegularBack in compliance
  14. 2019-04-01ArsenicMCL, Averagemeasured 0.0146 MG/LPeriod ended · no return to compliance on file
  15. 2019-01-01ArsenicMonitoring, RegularBack in compliance
  16. 2019-01-01ArsenicMCL, Averagemeasured 0.0147 MG/LPeriod ended · no return to compliance on file
  17. 2018-10-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2018-10-01ArsenicMCL, Averagemeasured 0.0147 MG/LPeriod ended · no return to compliance on file
  19. 2018-07-01ArsenicMCL, Averagemeasured 0.0154 MG/LPeriod ended · no return to compliance on file
  20. 2018-04-01ArsenicMCL, Averagemeasured 0.0111 MG/LPeriod ended · no return to compliance on file
  21. 2018-01-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
  22. 2017-10-01ArsenicMCL, Averagemeasured 0.0111 MG/LPeriod ended · no return to compliance on file
  23. 2017-07-01ArsenicMCL, Averagemeasured 0.0109 MG/LPeriod ended · no return to compliance on file
  24. 2017-04-01ArsenicMCL, Averagemeasured 0.0165 MG/LPeriod ended · no return to compliance on file
  25. 2017-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  26. 2017-01-01ArsenicMCL, Averagemeasured 0.0158 MG/LPeriod ended · no return to compliance on file
  27. 2016-10-01ArsenicMCL, Averagemeasured 0.0154 MG/LPeriod ended · no return to compliance on file
  28. 2016-07-01ArsenicMCL, Averagemeasured 0.0153 MG/LPeriod ended · no return to compliance on file
  29. 2016-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  30. 2016-04-01ArsenicMCL, Averagemeasured 0.0109 MG/LBack in compliance
  31. 2016-01-01ArsenicMCL, Averagemeasured 0.0106 MG/LBack in compliance
  32. 2015-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  33. 2014-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  34. 2013-10-01Dbp Stage 2Failure Submit IDSE/Subpart V Plan RptBack in compliance

System details

Population served903
Service connections264
Water sourceGroundwater
System typeCommunity Water System
OwnerNative American
StatusActive
CityFt Defiance
EPA ZIP on file86504

Areas served

    Reading this record

    Toadlena Ntua is a community water system that draws from groundwater and serves about 903 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.