Hydrohistorian
Mill Creek Wia
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| MILL CREEK | Intake | Surface water |
These are EPA's facility records, not DWR structures. Which decreed rights sit behind an intake is the next phase; nothing here is inferred.
DWR structures that name this system
Source Probable join · fetched 2026-09-09 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier
No DWR structure on file records this system as its contact, and none of its EPA intakes matches a structure name in its districts. DWR records a contact on only a fraction of structures, and only for districts fetched from its live service, so this is absence of a record, not evidence of no rights.
Compliance record
Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗
Nothing open today, but 15 health-based violations appear on the federal record historically. The history is below.
EPA's own summary: violations in 4 of the last 12 quarters. In violation for, in EPA's words: 0200=Surface Water Treatment Rule; 0300=Interim Enhanced Surface Water Treatment Rule; 1005=Arsenic; 1010=Barium; 1015=Cadmium; 1020=Chromium; 1035=Mercury; 1036=Nickel; 1045=Selenium; 1074=Antimony, Total; 1075=Beryllium, Total; 1085=Thallium, Total.
What happened
All 15 violation records on file, grouped into the 6 distinct things EPA's codes describe. Dates are the compliance period the violation is filed against.
Rule: Stage 2 Disinfectants and Disinfection Byproducts Rule.
Rule: Stage 2 Disinfectants and Disinfection Byproducts Rule.
Rule: Lead and Copper Rule -- corrosion of household plumbing.
Rule: Long Term 1 Enhanced Surface Water Treatment Rule.
Rule: Lead and Copper Rule -- corrosion of household plumbing.
Rule: Lead and Copper Rule -- corrosion of household plumbing.
Every violation record, as filed (12 of 15)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2020-07-01 – 2020-09-30 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2020-12-01) | 0.06128 MG/L (limit 0.06) |
| 2020-04-01 – 2020-06-30 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2020-12-01) | 62.65 UG/L (limit 60.0) |
| 2018-01-01 – 2018-03-31 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2018-05-31) | 72.6 UG/L (limit 60.0) |
| 2018-01-01 – 2018-03-31 | MCL, Average | TTHM | health-based | returned to compliance (2018-05-30) | 90.25 UG/L (limit 80.0) |
| 2017-10-01 – 2017-12-31 | MCL, Average | TTHM | health-based | returned to compliance (2018-05-30) | 97.95 UG/L |
| 2017-10-01 – 2017-12-31 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2018-05-31) | 83.25 UG/L |
| 2017-07-01 – 2017-09-30 | MCL, Average | TTHM | health-based | returned to compliance (2018-05-30) | 97.6 UG/L |
| 2017-07-01 – 2017-09-30 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2018-05-31) | 80.05 UG/L |
| 2017-04-01 – 2017-06-30 | MCL, Average | Total Haloacetic Acids (HAA5) | health-based | returned to compliance (2018-05-31) | 0.08038 MG/L |
| 2017-04-01 – 2017-06-30 | MCL, Average | TTHM | health-based | returned to compliance (2018-05-30) | 0.0941 MG/L |
| 2016-10-31 | OCCT/SOWT Treatment Installation/Demonstration | Lead and Copper Rule | health-based | returned to compliance (2017-05-11) | |
| 2016-06-01 – 2016-06-30 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2016-08-08) |
The remaining 3 are on the ECHO report.
What the regulator did about it
88 enforcement actions on this system's federal record. In Colorado the state is the primacy agency, so most actions are the state's; EPA acts directly on tribal systems and when it steps in.
| Date | Action | By |
|---|---|---|
| 2025-05-10 | St Public Notif received | state |
| 2025-01-20 | St Compliance achieved System collected IOC's in 2025 lmf 1/30/2025 |
state |
| 2025-01-14 | St Violation/Reminder Notice | state |
| 2025-01-14 | St Public Notif requested | state |
| 2025-01-13 | St Violation/Reminder Notice | state |
| 2025-01-13 | St Public Notif requested | state |
| 2025-01-13 | St Violation/Reminder Notice | state |
| 2025-01-13 | St Public Notif requested | state |
| 2025-01-13 | St Compliance achieved System submitted Dec 2024 MOR on 1/13/2025 lmf 1/30/2025 |
state |
| 2023-05-06 | St Public Notif received PN met with CCR. slh 5/8/23 |
state |
| 2022-03-18 | St Violation/Reminder Notice | state |
| 2022-03-18 | St Public Notif requested | state |
| 2022-03-01 | St Compliance achieved | state |
| 2022-01-09 | St Compliance achieved | state |
| 2021-12-16 | St Violation/Reminder Notice | state |
| 2021-12-16 | St Public Notif requested | state |
| 2021-03-12 | St Compliance achieved | state |
| 2020-12-01 | St Compliance achieved | state |
| 2020-11-11 | St Compliance achieved | state |
| 2020-11-11 | St Public Notif received | state |
20 most recent of 88; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.002 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. Copper 3.53 mg/L against 1.3 mg/L, above it. 21 results on file, 3 lead results over the action level all time.
The action level is not a health limit: it is the level at which the rule requires a system to act (corrosion control, public education, and in some cases replacing lead service lines). Lead mostly enters water from household plumbing, so a system-wide percentile does not tell you what comes out of one tap.
Violation, enforcement and lead/copper records are EPA SDWIS federal reporting, fetched monthly; the summary is EPA ECHO. Code names come from EPA's own REF_CODE_VALUE table. SDWIS carries violations, not routine sample results — nitrate, disinfection by-product and PFAS values are not in it, and a clean record here means nothing was reported as a violation, not that nothing was ever detected. For what was measured, ask the system for its Consumer Confidence Report.
PFAS and lithium: EPA's UCMR 5 monitoring, 2023–2025
Source Register of another agency · fetched 2026-09-09 · verify at EPA UCMR occurrence data ↗
EPA did not sample this system under UCMR 5 (the rule covered every system serving more than 3,300 people and a drawn sample of smaller ones).
Common questions
Who provides drinking water in Dumont, Colorado?
Mill Creek Wia is the public water system serving 67 people in Clear Creek County, from surface water. Its EPA public water system id is CO0210017.
Where does Mill Creek Wia get its water?
Mill Creek Wia reports surface water as its primary source. EPA lists its source facilities as MILL CREEK.
Does Mill Creek Wia have any drinking water violations?
EPA's compliance record shows no open health-based violations for Mill Creek Wia at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Clear Creek County.
The record
EPA SDWIS federal reporting as of 2026-09-08; the compliance record above is EPA's own, fetched monthly, and the ECHO report carries the rest. Report a problem →