Non-Transient Non-Community · PWSID NN0400339

Navajo National Monument

Serves 25 peopleGroundwaterOwner: FederalChinle, 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 2004: 48 violations. 18 missed or late tests · 30 notices or reports. Most recent began 2025-08-01.

None of them is a measurement of contaminated water.

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

0Over the limit
0Treatment lapse
18Missed or late test
30Notice or report2 open

More violations on record than 86% 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

2004 · Missed or late test: 120052008 · Missed or late test: 120102013 · Missed or late test: 12015 · Missed or late test: 120152016 · Notice or report: 12017 · Missed or late test: 12018 · Missed or late test: 22018 · Missed or late test: 22019 · Notice or report: 52019 · Notice or report: 52019 · Notice or report: 52019 · Notice or report: 52019 · Notice or report: 52020 · Missed or late test: 32020 · Missed or late test: 32020 · Missed or late test: 32020 · Notice or report: 62020 · Notice or report: 62020 · Notice or report: 62020 · Notice or report: 62020 · Notice or report: 62020 · Notice or report: 620202021 · Missed or late test: 22021 · Missed or late test: 22021 · Notice or report: 12022 · Missed or late test: 42022 · Missed or late test: 42022 · Missed or late test: 42022 · Missed or late test: 42022 · Notice or report: 42022 · Notice or report: 42022 · Notice or report: 42022 · Notice or report: 42023 · Missed or late test: 22023 · Missed or late test: 22023 · Notice or report: 72023 · Notice or report: 72023 · Notice or report: 72023 · Notice or report: 72023 · Notice or report: 72023 · Notice or report: 72023 · Notice or report: 72024 · Notice or report: 32024 · Notice or report: 32024 · Notice or report: 32025 · Notice or report: 32025 · Notice or report: 32025 · Notice or report: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
38% missed or late test · 1863% notice or report · 30

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 3 results on file · action level 15 ppb

below 5 ppb
below 5 ppb
below 5 ppb

Open now (2)

  1. 2025-08-01Revised Total Coliform RuleRPTOpen
  2. 2025-07-01Revised Total Coliform RuleRPTOpen

Every violation on record

  1. 2025-08-01Revised Total Coliform RuleRPTOpen
  2. 2025-07-01Revised Total Coliform RuleRPTOpen
  3. 2025-06-01Revised Total Coliform RuleRPTBack in compliance
  4. 2024-12-01Revised Total Coliform RuleRPTBack in compliance
  5. 2024-11-01Revised Total Coliform RuleRPTBack in compliance
  6. 2024-04-01Revised Total Coliform RuleRPTBack in compliance
  7. 2023-11-01Revised Total Coliform RuleRPTBack in compliance
  8. 2023-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  9. 2023-06-01Revised Total Coliform RuleRPTBack in compliance
  10. 2023-05-01Revised Total Coliform RuleRPTBack in compliance
  11. 2023-04-01Revised Total Coliform RuleRPTBack in compliance
  12. 2023-03-01Revised Total Coliform RuleRPTBack in compliance
  13. 2023-02-01Revised Total Coliform RuleRPTBack in compliance
  14. 2023-01-01Revised Total Coliform RuleRPTBack in compliance
  15. 2023-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  16. 2022-10-01Revised Total Coliform RuleRPTBack in compliance
  17. 2022-10-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  18. 2022-09-01Revised Total Coliform RuleRPTBack in compliance
  19. 2022-08-01Revised Total Coliform RuleRPTBack in compliance
  20. 2022-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  21. 2022-06-01Revised Total Coliform RuleRPTBack in compliance
  22. 2022-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  23. 2022-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  24. 2021-11-01Revised Total Coliform RuleMONBack in compliance
  25. 2021-10-01Revised Total Coliform RuleMONBack in compliance
Show the other 23 entries
  1. 2021-01-01Revised Total Coliform RuleRPTBack in compliance
  2. 2020-12-01Revised Total Coliform RuleRPTBack in compliance
  3. 2020-11-01Revised Total Coliform RuleRPTBack in compliance
  4. 2020-10-01Revised Total Coliform RuleRPTBack in compliance
  5. 2020-06-01Revised Total Coliform RuleMONBack in compliance
  6. 2020-05-01Revised Total Coliform RuleMONBack in compliance
  7. 2020-04-01Revised Total Coliform RuleMONBack in compliance
  8. 2020-03-01Revised Total Coliform RuleRPTBack in compliance
  9. 2020-02-01Revised Total Coliform RuleRPTBack in compliance
  10. 2020-01-01Revised Total Coliform RuleRPTBack in compliance
  11. 2019-11-01Revised Total Coliform RuleRPTBack in compliance
  12. 2019-10-01Revised Total Coliform RuleRPTBack in compliance
  13. 2019-04-01Revised Total Coliform RuleRPTBack in compliance
  14. 2019-03-01Revised Total Coliform RuleRPTBack in compliance
  15. 2019-02-01Revised Total Coliform RuleRPTBack in compliance
  16. 2018-01-01NitriteMonitoring, RegularBack in compliance
  17. 2018-01-01NitrateMonitoring, RegularBack in compliance
  18. 2017-12-01Revised Total Coliform RuleMONBack in compliance
  19. 2016-04-01Revised Total Coliform RuleOtherBack in compliance
  20. 2015-12-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  21. 2013-10-01Dbp Stage 2Failure Submit IDSE/Subpart V Plan RptBack in compliance
  22. 2008-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  23. 2004-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served25
Service connections14
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerFederal
StatusActive
CityChinle
EPA ZIP on file86503

Areas served

  • Shonto

Reading this record

Navajo National Monument is a non-transient non-community that draws from groundwater and serves about 25 people in Chinle, 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.