Public water system record
Mill Creek Wia
On record as serving Clear Creek County, CO · Serves 67 people
Federal records show 12 health-based violations and 23 monitoring/reporting issues for Mill Creek Wia in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.
System profile
- Health-based violations, last 10 years
- 12
- Resolved
- 12
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 23
Key facts
- Mill Creek Wia draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 83.25 µg/L, federal limit 60 µg/L (1.4 times the limit), 2017.
- Most recent enforcement action: boil water order by Colorado, July 2015.
- Record on file since 1992, with 21 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 40 service lines.
Check whether Mill Creek Wia serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.06128 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jul 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 62.65 µg/L, federal limit 60 µg/L (at or just above the limit)
|
220 | Apr 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 72.6 µg/L, federal limit 60 µg/L (1.2 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90.25 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 97.95 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 83.25 µg/L, federal limit 60 µg/L (1.4 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 97.6 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 80.05 µg/L, federal limit 60 µg/L (1.3 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.08038 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0941 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Lead and Copper Rule
Treatment technique failure
|
350 | Oct 31, 2016 | Resolved | No |
|
Lead and Copper Rule
Treatment technique failure
|
350 | Jan 24, 2014 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Dec 1, 2024 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Dec 1, 2024 | Resolved |
|
Selenium
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Thallium, Total
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Beryllium, Total
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Antimony, Total
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Nickel
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Mercury
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Chromium (total)
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Cadmium
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Barium
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2022 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2021 | Resolved |
|
Public Notice
OTHER
|
Oct 12, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 4, 2020 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Public Notice
OTHER
|
Apr 21, 2018 | Resolved |
|
Public Notice
OTHER
|
Jan 12, 2018 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Nov 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Mar 11, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2016 | Resolved |
Full record since 1992
EPA's records for Mill Creek Wia go back to 1992. Before October 19, 2016 they list 21 health-based violations (21 resolved) and 44 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 6 |
| 2000s | 13 | 36 |
| 2010 to October 18, 2016 | 5 | 2 |
| October 19, 2016 to 2019 | 9 | 6 |
| 2020s | 2 | 16 |
Most recent health-based violation before October 19, 2016: Interim Enhanced Surface Water Treatment Rule (acute), began June 2016, Resolved.
Show all 21 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jun 1, 2016 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Apr 1, 2015 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 24, 2014 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jul 1, 2011 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2010 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2001 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1994 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 1994 | Resolved |
Enforcement actions
Colorado regulators took 1 formal enforcement action against Mill Creek Wia and issued 1 boil water order between 2008 and 2015. The most recent was a boil water order in July 2015.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 27, 2015 | Colorado | Boil water order | 1 violation |
| Aug 29, 2008 | Colorado | Compliance order (no penalty) | 14 violations (13 health-based): Lead and Copper Rule, Surface Water Treatment Rule |
What the violations mean
Haloacetic Acids (HAA5)
6 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Total Trihalomethanes (TTHMs)
4 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Lead and Copper Rule
2 incidentsThe system did not complete a treatment step or action that the Lead and Copper Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Mill Creek Wia draws water from 1 surface water intake.
Annual water quality report
Mill Creek Wia must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Mill Creek Wia for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Colorado.
Certified drinking water labs by state EPA guidance for private wells