Community Water System · PWSID NN0436006

Dilcon Community Boarding School Bia

Serves 473 peopleGroundwaterOwner: FederalWinslow, ArizonaServes a school or daycare
Nothing open that measures the water, but 1 open testing or paperwork violation.

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: 34 violations. 2 over the limit · 20 missed or late tests · 12 notices or reports. Most recent began 2025-04-01.

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

2Over the limit
0Treatment lapse
20Missed or late test
12Notice or report1 open

More violations on record than 80% 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: 12005 · Notice or report: 120052006 · Notice or report: 120102013 · Missed or late test: 12013 · Notice or report: 12014 · Notice or report: 12015 · Over the limit: 12015 · Notice or report: 22015 · Notice or report: 220152016 · Notice or report: 12020 · Missed or late test: 12020 · Notice or report: 120202021 · Missed or late test: 12022 · Missed or late test: 12022 · Notice or report: 12023 · Missed or late test: 52023 · Missed or late test: 52023 · Missed or late test: 52023 · Missed or late test: 52023 · Missed or late test: 52023 · Notice or report: 12024 · Over the limit: 12024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Notice or report: 12025 · Missed or late test: 42025 · Missed or late test: 42025 · Missed or late test: 42025 · Missed or late test: 42025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
6% over the limit · 259% missed or late test · 2035% 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

1.6 ppb
1.5 ppb
1.1 ppb
0.9 ppb

Open now (1)

  1. 2025-03-01Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-04-01ArsenicMonitoring, RegularPeriod ended · no return to compliance on file
  2. 2025-03-01Public NoticePN Violation for NPDWR ViolationOpen
  3. 2025-03-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  4. 2025-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  5. 2025-01-01ArsenicMonitoring, RegularPeriod ended · no return to compliance on file
  6. 2024-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  7. 2024-10-01ArsenicMonitoring, RegularPeriod ended · no return to compliance on file
  8. 2024-07-01ArsenicMonitoring, RegularBack in compliance
  9. 2024-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  10. 2024-01-01NitriteMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2024-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2024-01-01ArsenicMonitoring, RegularBack in compliance
  13. 2024-01-01ArsenicMCL, Averagemeasured 0.0120 MG/LBack in compliance
  14. 2023-10-01Revised Total Coliform RuleRPTBack in compliance
  15. 2023-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  16. 2023-07-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  17. 2023-04-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  18. 2023-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  19. 2023-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  20. 2022-10-01Revised Total Coliform RuleRPTBack in compliance
  21. 2022-01-01SodiumMonitoring, RegularPeriod ended · no return to compliance on file
  22. 2021-01-01Revised Total Coliform RuleMONBack in compliance
  23. 2020-05-01Revised Total Coliform RuleRPTBack in compliance
  24. 2020-04-01Revised Total Coliform RuleMONBack in compliance
  25. 2016-04-01Revised Total Coliform RuleOtherBack in compliance
Show the other 9 entries
  1. 2015-10-01ArsenicMCL, Averagemeasured 0.0103 MG/LBack in compliance
  2. 2015-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2015-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  4. 2014-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  5. 2013-10-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2013-10-01Dbp Stage 2Failure Submit IDSE/Subpart V Plan RptBack in compliance
  7. 2006-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  8. 2005-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  9. 2004-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served473
Service connections60
Water sourceGroundwater
System typeCommunity Water System
OwnerFederal
StatusActive
CityWinslow
EPA ZIP on file86047

Areas served

  • Dilcon

Reading this record

Dilcon Community Boarding School Bia is a community water system that draws from groundwater and serves about 473 people in Winslow, 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.