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Public water system record

Hidden Valley Water District

Serves an area of Jefferson County, CO · 155 people served

Federal records show 3 health-based violations and 12 monitoring/reporting issues for Hidden Valley Water District in the last ten years. The most serious issue in this window was a resolved LEAD AND COPPER RULE REVISIONS violation.

  • CO0130045
  • EVERGREEN
  • CO
  • 155 served

System profile

Source water Purchased surface water
ZIP 80439
EPA system ID CO0130045

Verify this system on EPA ECHO →

Health-based violations, last 10 years
3
Resolved
3
Unresolved
0
Any acute record
Yes
Monitoring issues, last 10 years
12

Key facts

  • Hidden Valley Water District buys its water from Evergreen MD.
  • Highest measured level in the last 10 years: Nitrate, 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit), 2018.
  • Most recent enforcement action: boil water order by Colorado, April 2019.
  • Record on file since 1993, with 18 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 63 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Resolved No
Stage 1 Disinfection Byproducts Rule
Treatment technique failure
 210 Dec 1, 2023 Resolved No
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
 330 Apr 1, 2018 Resolved Yes

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Feb 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Feb 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jan 1, 2024 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Jan 1, 2024 Resolved
Chlorine
Monitoring and reporting
 Jan 1, 2024 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Dec 1, 2023 Resolved
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2023 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Nov 1, 2023 Resolved
Revised Total Coliform Rule
Monitoring violation
 Nov 1, 2023 Resolved
Chlorine
Monitoring and reporting
 Oct 1, 2023 Resolved
Nitrate
Monitoring and reporting
 Apr 1, 2020 Resolved

Full record since 1993

EPA's records for Hidden Valley Water District go back to 1993. Before October 19, 2016 they list 18 health-based violations (18 resolved) and 12 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 2 1
2000s 4 7
2010 to October 18, 2016 12 4
October 19, 2016 to 2019 1 0
2020s 2 12

Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began January 2016, Resolved.

Show all 18 health-based violations before October 19, 2016
Contaminant Start date Status
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jan 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.53 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 Oct 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.05 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jul 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Apr 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jan 1, 2014 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2013 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 46 pCi/L, federal limit 15 pCi/L (3.1 times the limit)
 Jan 1, 2011 Resolved
Combined Uranium
Contaminant limit exceeded
Measured 37 µg/L, federal limit 30 µg/L (1.2 times the limit)
 Jan 1, 2011 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 9 pCi/L, federal limit 5 pCi/L (1.8 times the limit)
 Jan 1, 2011 Resolved
Combined Uranium
Contaminant limit exceeded
Measured 36.75 µg/L, federal limit 30 µg/L (1.2 times the limit)
 Apr 1, 2010 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 31.46 pCi/L, federal limit 15 pCi/L (2.1 times the limit)
 Apr 1, 2010 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 33 pCi/L, federal limit 15 pCi/L (2.2 times the limit)
 Jan 1, 2010 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 40.69 pCi/L, federal limit 15 pCi/L (2.7 times the limit)
 Oct 1, 2009 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.45 pCi/L, federal limit 5 pCi/L (1.1 times the limit)
 Oct 1, 2008 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jul 1, 2008 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2007 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 1995 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 1994 Resolved

Enforcement actions

Colorado regulators took 4 formal enforcement actions against Hidden Valley Water District and issued 1 boil water order between 2009 and 2019. The most recent was a boil water order in April 2019.

Date By Action Violations covered
Apr 5, 2019 Colorado Boil water order 1 violation
May 2, 2017 Colorado Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Apr 22, 2016 Colorado Compliance order (no penalty) 5 violations (5 health-based): Combined Radium (-226 and -228)
Jul 26, 2010 Colorado Compliance order (no penalty) 8 violations (8 health-based): Gross Alpha, Excl. Radon and U, Combined Uranium, Combined Radium (-226 and -228)
Jan 15, 2009 Colorado Compliance order (no penalty) 3 violations (3 health-based): Combined Radium (-226 and -228)

What the violations mean

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Stage 1 Disinfection Byproducts Rule

1 incident

The system did not meet a treatment requirement of the Stage 1 Disinfectants and Disinfection Byproducts Rule

Byproducts form when disinfectants react with natural material in water. Long-term exposure above federal limits may increase cancer risk

Nitrate

1 incident

Nitrate exceeded the federal limit

High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome

Where the water comes from

Hidden Valley Water District buys its water from Evergreen MD. EPA also lists 3 wells, all for emergency, seasonal or other part-time use.

Buys water from

Annual water quality report

Hidden Valley Water District 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 Hidden Valley Water District 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