Community Water System · PWSID CO0210017

Mill Creek Wia

Serves 67 peopleSurface WaterOwner: PrivateDumont, Colorado
Nothing open right now.

On record since 2003: 41 violations. 10 over the limit · 5 treatment lapses · 22 missed or late tests · 4 notices or reports. Most recent began 2024-12-01.

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

10Over the limit
5Treatment lapse
22Missed or late test
4Notice or report

More violations on record than 90% 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

2003 · Missed or late test: 1200520102011 · Treatment lapse: 12014 · Treatment lapse: 12015 · Treatment lapse: 12015 · Missed or late test: 120152016 · Treatment lapse: 22016 · Missed or late test: 12017 · Over the limit: 62017 · Over the limit: 62017 · Over the limit: 62017 · Missed or late test: 12017 · Notice or report: 12018 · Over the limit: 22018 · Missed or late test: 22018 · Notice or report: 22020 · Over the limit: 22020 · Missed or late test: 12020 · Notice or report: 120202021 · Missed or late test: 12022 · Missed or late test: 12024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132025
One square ≈ 2 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
24% over the limit · 1012% treatment lapse · 554% missed or late test · 2210% notice or report · 4

Across Colorado, 74% of violations are missed or late tests and 6% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Total Haloacetic Acids (HAA5)Trihalomethanes (TTHM)2020-07-01 · Total Haloacetic Acids (HAA5): measured 0.0613 MG/L vs limit 0.0600 MG/L (1.0×)2020-04-01 · Total Haloacetic Acids (HAA5): measured 62.65 UG/L vs limit 60.00 UG/L (1.0×)2018-01-01 · Total Haloacetic Acids (HAA5): measured 72.60 UG/L vs limit 60.00 UG/L (1.2×)2018-01-01 · Trihalomethanes (TTHM): measured 90.25 UG/L vs limit 80.00 UG/L (1.1×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

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 19 results on file · action level 15 ppb

31.5 ppb
20.2 ppb
15.9 ppb
11.8 ppb
11 ppb
11 ppb
7 ppb
7 ppb
6.5 ppb
6 ppb
5 ppb
4.5 ppb
4 ppb
4 ppb
3 ppb
2 ppb
1.5 ppb
1.5 ppb
0 ppb

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

3.5 mg/L

Every violation on record

  1. 2024-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  2. 2024-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  3. 2024-01-01SeleniumMonitoring, RegularBack in compliance
  4. 2024-01-01Thallium, TotalMonitoring, RegularBack in compliance
  5. 2024-01-01Beryllium, TotalMonitoring, RegularBack in compliance
  6. 2024-01-01Antimony, TotalMonitoring, RegularBack in compliance
  7. 2024-01-01SodiumMonitoring, RegularBack in compliance
  8. 2024-01-01NickelMonitoring, RegularBack in compliance
  9. 2024-01-01MercuryMonitoring, RegularBack in compliance
  10. 2024-01-01ChromiumMonitoring, RegularBack in compliance
  11. 2024-01-01CadmiumMonitoring, RegularBack in compliance
  12. 2024-01-01BariumMonitoring, RegularBack in compliance
  13. 2024-01-01ArsenicMonitoring, RegularBack in compliance
  14. 2022-02-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  15. 2021-11-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  16. 2020-10-12Public NoticePN Violation for NPDWR ViolationBack in compliance
  17. 2020-09-04Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  18. 2020-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0613 MG/L · limit 0.0600 MG/LBack in compliance
  19. 2020-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 62.65 UG/L · limit 60.00 UG/LBack in compliance
  20. 2018-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  21. 2018-04-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  22. 2018-01-12Public NoticePN Violation for NPDWR ViolationBack in compliance
  23. 2018-01-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  24. 2018-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 72.60 UG/L · limit 60.00 UG/LBack in compliance
  25. 2018-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 90.25 UG/L · limit 80.00 UG/LBack in compliance
Show the other 16 entries
  1. 2017-11-01E. ColiMonitoring, Source Water (LT2)Back in compliance
  2. 2017-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 97.95 UG/LBack in compliance
  3. 2017-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 83.25 UG/LBack in compliance
  4. 2017-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 97.60 UG/LBack in compliance
  5. 2017-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 80.05 UG/LBack in compliance
  6. 2017-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0804 MG/LBack in compliance
  7. 2017-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0941 MG/LBack in compliance
  8. 2017-03-11Public NoticePN Violation for NPDWR ViolationBack in compliance
  9. 2016-10-31Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationBack in compliance
  10. 2016-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  11. 2016-06-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  12. 2015-04-01Lead and Copper RulePublic EducationBack in compliance
  13. 2015-02-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  14. 2014-01-24Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationBack in compliance
  15. 2011-07-01Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance
  16. 2003-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served67
Service connections40
Water sourceSurface Water
System typeCommunity Water System
OwnerPrivate
StatusActive
CityDumont
EPA ZIP on file80436

Areas served

  • Clear Creek County

Reading this record

Mill Creek Wia is a community water system that draws from surface water and serves about 67 people in Dumont, 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.