Community Water System · PWSID CO0111100

Antonito Town of

Serves 981 peopleGroundwater Under InfluenceOwner: Local GovernmentAntonito, Colorado
Nothing open right now.

On record since 2012: 93 violations. 10 treatment lapses · 71 missed or late tests · 12 notices or reports. Most recent began 2025-07-01.

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
10Treatment lapse
71Missed or late test
12Notice or report

More violations on record than 96% of active water systems in Colorado. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102012 · Treatment lapse: 12012 · Notice or report: 12013 · Missed or late test: 12013 · Notice or report: 12015 · Treatment lapse: 12015 · Missed or late test: 42015 · Missed or late test: 420152016 · Treatment lapse: 12016 · Missed or late test: 72016 · Missed or late test: 72016 · Missed or late test: 72016 · Notice or report: 32017 · Treatment lapse: 12017 · Missed or late test: 142017 · Missed or late test: 142017 · Missed or late test: 142017 · Missed or late test: 142017 · Missed or late test: 142017 · Notice or report: 12018 · Treatment lapse: 52018 · Treatment lapse: 52018 · Missed or late test: 22019 · Treatment lapse: 12019 · Missed or late test: 42019 · Missed or late test: 42019 · Notice or report: 22020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Missed or late test: 252020 · Notice or report: 220202021 · Notice or report: 12022 · Missed or late test: 22022 · Notice or report: 12023 · Missed or late test: 42023 · Missed or late test: 42024 · Missed or late test: 22025 · Missed or late test: 62025 · Missed or late test: 62025
One square ≈ 3 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
11% treatment lapse · 1076% missed or late test · 7113% notice or report · 12

Across Colorado, 74% of violations are missed or late tests and 6% 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 13 results on file · action level 15 ppb

6 ppb
5 ppb
5 ppb
3 ppb
1 ppb
1 ppb
1 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Copper, 90th percentile 1 result on file · action level 1.3 mg/L

4.8 mg/L

Every violation on record

  1. 2025-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  2. 2025-07-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  3. 2025-07-01Revised Total Coliform RuleMONBack in compliance
  4. 2025-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  5. 2025-01-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Period ended · no return to compliance on file
  6. 2025-01-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  7. 2024-07-01Carbon, TotalMonitoring and Reporting (DBP)Back in compliance
  8. 2024-01-01Carbon, TotalMonitoring and Reporting (DBP)Back in compliance
  9. 2023-09-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  10. 2023-09-01Revised Total Coliform RuleMONBack in compliance
  11. 2023-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  12. 2023-07-01Carbon, TotalMonitoring and Reporting (DBP)Back in compliance
  13. 2022-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  14. 2022-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  15. 2022-02-25Public NoticePN Violation without NPDWR ViolationBack in compliance
  16. 2021-11-25Public NoticePN Violation without NPDWR ViolationBack in compliance
  17. 2020-08-27Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2020-07-01StyreneMonitoring, RegularBack in compliance
  19. 2020-07-01EthylbenzeneMonitoring, RegularBack in compliance
  20. 2020-07-01TolueneMonitoring, RegularBack in compliance
  21. 2020-07-01BenzeneMonitoring, RegularBack in compliance
  22. 2020-07-01ChlorobenzeneMonitoring, RegularBack in compliance
  23. 2020-07-01TetrachloroethyleneMonitoring, RegularBack in compliance
  24. 2020-07-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  25. 2020-07-01TrichloroethyleneMonitoring, RegularBack in compliance
Show the other 68 entries
  1. 2020-07-011,2-DichloropropaneMonitoring, RegularBack in compliance
  2. 2020-07-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  3. 2020-07-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  4. 2020-07-011,2-DichloroethaneMonitoring, RegularBack in compliance
  5. 2020-07-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  6. 2020-07-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  7. 2020-07-01Vinyl chlorideMonitoring, RegularBack in compliance
  8. 2020-07-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  9. 2020-07-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  10. 2020-07-01DichloromethaneMonitoring, RegularBack in compliance
  11. 2020-07-01Xylenes, TotalMonitoring, RegularBack in compliance
  12. 2020-07-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  13. 2020-07-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
  14. 2020-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  15. 2020-04-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  16. 2020-04-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  17. 2020-02-17Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2020-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  19. 2019-11-17Public NoticePN Violation for NPDWR ViolationBack in compliance
  20. 2019-10-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  21. 2019-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  22. 2019-07-01Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance
  23. 2019-07-01Lead and Copper RuleInitial, Follow-up, or Routine Source Water M/RBack in compliance
  24. 2019-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  25. 2019-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  26. 2018-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  27. 2018-05-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  28. 2018-04-25DBP Stage 1Treatment Technique No Certif. OperatorBack in compliance
  29. 2018-04-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  30. 2018-04-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  31. 2018-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  32. 2018-02-11Groundwater RuleFailure To Address DeficiencyBack in compliance
  33. 2017-11-02Public NoticePN Violation for NPDWR ViolationBack in compliance
  34. 2017-11-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  35. 2017-11-01Revised Total Coliform RuleMONBack in compliance
  36. 2017-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  37. 2017-10-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  38. 2017-10-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  39. 2017-09-13DBP Stage 1Treatment Technique No Certif. OperatorBack in compliance
  40. 2017-07-01Carbon, TotalMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  41. 2017-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  42. 2017-05-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  43. 2017-04-01Carbon, TotalMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  44. 2017-04-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  45. 2017-04-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  46. 2017-04-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  47. 2017-03-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  48. 2017-03-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  49. 2016-12-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  50. 2016-12-02Public NoticePN Violation for NPDWR ViolationBack in compliance
  51. 2016-11-01DBP Stage 1Treatment Technique No Certif. OperatorBack in compliance
  52. 2016-10-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  53. 2016-10-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  54. 2016-07-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  55. 2016-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  56. 2016-07-01Revised Total Coliform RuleMONBack in compliance
  57. 2016-03-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  58. 2016-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  59. 2016-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  60. 2015-10-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  61. 2015-10-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  62. 2015-08-01Surface water treatment (SWTR)Failure to Filter (SWTR)Back in compliance
  63. 2015-04-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  64. 2015-04-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  65. 2013-12-05Public NoticePN Violation for NPDWR ViolationBack in compliance
  66. 2013-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  67. 2012-06-10Public NoticePN Violation for NPDWR ViolationBack in compliance
  68. 2012-03-23Groundwater RuleFailure To Address DeficiencyBack in compliance

System details

Population served981
Service connections435
Water sourceGroundwater Under Influence
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityAntonito
EPA ZIP on file81120

Areas served

  • Conejos County

Reading this record

Antonito Town of is a community water system that draws from groundwater under influence and serves about 981 people in Antonito, Colorado. 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.