Public water system record

Patterson Valley WC

On record as serving Otero County, CO · Serves 96 people

Federal records show 68 health-based violations and 27 monitoring/reporting issues for Patterson Valley WC in the last ten years. The most serious issue in this window was a Gross Alpha, Excl. Radon and U violation that EPA lists as archived, not resolved.

CO0145540
ROCKY FORD
CO
96 served

System profile

Source water Groundwater

ZIP 81067

EPA system ID CO0145540

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 68
Resolved: 0
Unresolved: 0
Archived by EPA: 68
Any acute record: No
Monitoring issues, last 10 years: 27

Key facts

Patterson Valley WC draws water from 1 well.
Highest measured level in the last 10 years: Combined Radium (-226 and -228), 30.07 pCi/L, federal limit 5 pCi/L (6 times the limit), 2019.
Most recent formal enforcement: compliance order (no penalty) by Colorado, May 2022.
Record on file since 1991, with 26 health-based violations before October 19, 2016.
Lead pipe inventory: 0 lead and 0 unknown out of 42 service lines.

Check whether Patterson Valley WC serves your address

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
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 22 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Oct 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Oct 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 31 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 39 pCi/L, federal limit 15 pCi/L (2.6 times the limit)	340	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.68 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Jan 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 38.45 pCi/L, federal limit 15 pCi/L (2.6 times the limit)	340	Jan 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.8 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Oct 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 37.7 pCi/L, federal limit 15 pCi/L (2.5 times the limit)	340	Oct 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27.2 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Jul 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 41.6 pCi/L, federal limit 15 pCi/L (2.8 times the limit)	340	Jul 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27.6 pCi/L, federal limit 5 pCi/L (5.5 times the limit)	340	Apr 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 45.5 pCi/L, federal limit 15 pCi/L (3 times the limit)	340	Apr 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.13 pCi/L, federal limit 5 pCi/L (5.8 times the limit)	340	Jan 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 50.67 pCi/L, federal limit 15 pCi/L (3.4 times the limit)	340	Jan 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27.3 pCi/L, federal limit 5 pCi/L (5.5 times the limit)	340	Oct 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 55.85 pCi/L, federal limit 15 pCi/L (3.7 times the limit)	340	Oct 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.3 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Jul 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 44.25 pCi/L, federal limit 15 pCi/L (3 times the limit)	340	Jul 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.6 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Apr 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 45.1 pCi/L, federal limit 15 pCi/L (3 times the limit)	340	Apr 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.6 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Jan 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 45.1 pCi/L, federal limit 15 pCi/L (3 times the limit)	340	Jan 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 23 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Oct 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 25 pCi/L, federal limit 5 pCi/L (5 times the limit)	340	Oct 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 22 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Jul 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	340	Jul 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 22 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Apr 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29 pCi/L, federal limit 5 pCi/L (5.8 times the limit)	340	Apr 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 22 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Jan 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29 pCi/L, federal limit 5 pCi/L (5.8 times the limit)	340	Jan 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 23 pCi/L, federal limit 15 pCi/L (1.5 times the limit)	340	Oct 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.8 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Oct 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 28.75 pCi/L, federal limit 15 pCi/L (1.9 times the limit)	340	Jul 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.93 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Jul 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 35 pCi/L, federal limit 15 pCi/L (2.3 times the limit)	340	Apr 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 30 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Apr 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 33 pCi/L, federal limit 15 pCi/L (2.2 times the limit)	340	Jan 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 30 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Jan 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 31 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Oct 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.25 pCi/L, federal limit 5 pCi/L (5.9 times the limit)	340	Oct 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 28.25 pCi/L, federal limit 15 pCi/L (1.9 times the limit)	340	Jul 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27.38 pCi/L, federal limit 5 pCi/L (5.5 times the limit)	340	Jul 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 25.5 pCi/L, federal limit 5 pCi/L (5.1 times the limit)	340	Apr 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 25.5 pCi/L, federal limit 15 pCi/L (1.7 times the limit)	340	Apr 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 25.57 pCi/L, federal limit 5 pCi/L (5.1 times the limit)	340	Jan 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 28.5 pCi/L, federal limit 15 pCi/L (1.9 times the limit)	340	Jan 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 25.65 pCi/L, federal limit 5 pCi/L (5.1 times the limit)	340	Oct 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 32 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Oct 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27.57 pCi/L, federal limit 5 pCi/L (5.5 times the limit)	340	Jul 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 31.5 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Jul 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.5 pCi/L, federal limit 5 pCi/L (5.9 times the limit)	340	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 31.5 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 30.07 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 31 pCi/L, federal limit 15 pCi/L (2.1 times the limit)	340	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.93 pCi/L, federal limit 5 pCi/L (6 times the limit)	340	Oct 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 35 pCi/L, federal limit 15 pCi/L (2.3 times the limit)	340	Oct 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 29.3 pCi/L, federal limit 5 pCi/L (5.9 times the limit)	340	Jul 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 37.5 pCi/L, federal limit 15 pCi/L (2.5 times the limit)	340	Jul 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.7 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Apr 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 35 pCi/L, federal limit 15 pCi/L (2.3 times the limit)	340	Apr 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26.7 pCi/L, federal limit 5 pCi/L (5.3 times the limit)	340	Jan 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 35 pCi/L, federal limit 15 pCi/L (2.3 times the limit)	340	Jan 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 25 pCi/L, federal limit 15 pCi/L (1.7 times the limit)	340	Jan 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 26 pCi/L, federal limit 5 pCi/L (5.2 times the limit)	340	Jan 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 22 pCi/L, federal limit 5 pCi/L (4.4 times the limit)	340	Jan 1, 2016	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 21 pCi/L, federal limit 15 pCi/L (1.4 times the limit)	340	Jan 1, 2016	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No

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 Monitoring and reporting	Jan 1, 2025	Resolved
Public Notice OTHER	Oct 1, 2024	Resolved
Lead and Copper Rule Monitoring and reporting	Oct 1, 2024	Resolved
E. coli Monitoring and reporting	Jul 12, 2024	Resolved
Toluene Monitoring and reporting	Jan 1, 2024	Resolved
Nitrate Monitoring and reporting	Jan 1, 2024	Resolved
Combined Radium (-226 and -228) Monitoring and reporting	Jan 1, 2024	Resolved
Combined Uranium Monitoring and reporting	Jan 1, 2024	Resolved
Gross Alpha, Excl. Radon and U Monitoring and reporting	Jan 1, 2024	Resolved
Combined Uranium Monitoring and reporting	Oct 1, 2023	Resolved
Public Notice OTHER	Oct 1, 2023	Resolved
Public Notice OTHER	Oct 1, 2020	Resolved
Public Notice OTHER	Jan 1, 2020	Resolved
Public Notice OTHER	Oct 1, 2019	Resolved
Combined Radium (-226 and -228) Monitoring and reporting	Apr 1, 2018	Resolved
Combined Uranium Monitoring and reporting	Apr 1, 2018	Resolved
Gross Alpha, Excl. Radon and U Monitoring and reporting	Apr 1, 2018	Resolved
Selenium Monitoring and reporting	Jan 1, 2014	Resolved
Thallium, Total Monitoring and reporting	Jan 1, 2014	Resolved
Beryllium, Total Monitoring and reporting	Jan 1, 2014	Resolved
Antimony, Total Monitoring and reporting	Jan 1, 2014	Resolved
Nickel Monitoring and reporting	Jan 1, 2014	Resolved
Mercury Monitoring and reporting	Jan 1, 2014	Resolved
Chromium (total) Monitoring and reporting	Jan 1, 2014	Resolved
Cadmium Monitoring and reporting	Jan 1, 2014	Resolved
Barium Monitoring and reporting	Jan 1, 2014	Resolved
Arsenic Monitoring and reporting	Jan 1, 2014	Resolved

Full record since 1991

EPA's records for Patterson Valley WC go back to 1991. Before October 19, 2016 they list 26 health-based violations (3 resolved, 23 archived by EPA without a recorded fix) and 14 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
1990s	6	0
2000s	6	1
2010 to October 18, 2016	14	13
October 19, 2016 to 2019	18	4
2020s	48	13

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

Show all 26 health-based violations before October 19, 2016

Contaminant	Start date	Status
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 22 pCi/L, federal limit 5 pCi/L (4.4 times the limit)	Jan 1, 2016	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 21 pCi/L, federal limit 15 pCi/L (1.4 times the limit)	Jan 1, 2016	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 34 pCi/L, federal limit 15 pCi/L (2.3 times the limit)	Jan 1, 2015	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 24 pCi/L, federal limit 5 pCi/L (4.8 times the limit)	Jan 1, 2015	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 23 pCi/L, federal limit 5 pCi/L (4.6 times the limit)	Jan 1, 2014	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 43 pCi/L, federal limit 15 pCi/L (2.9 times the limit)	Jan 1, 2014	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 20 pCi/L, federal limit 5 pCi/L (4 times the limit)	Jan 1, 2013	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 26 pCi/L, federal limit 15 pCi/L (1.7 times the limit)	Jan 1, 2013	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 22.8 pCi/L, federal limit 5 pCi/L (4.6 times the limit)	Jan 1, 2012	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 42 pCi/L, federal limit 15 pCi/L (2.8 times the limit)	Jan 1, 2012	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 36 pCi/L, federal limit 15 pCi/L (2.4 times the limit)	Jan 1, 2011	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 24 pCi/L, federal limit 5 pCi/L (4.8 times the limit)	Jan 1, 2011	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 37 pCi/L, federal limit 15 pCi/L (2.5 times the limit)	Jan 1, 2010	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 22 pCi/L, federal limit 5 pCi/L (4.4 times the limit)	Jan 1, 2010	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 27 pCi/L, federal limit 5 pCi/L (5.4 times the limit)	Jan 1, 2009	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 30 pCi/L, federal limit 15 pCi/L (2 times the limit)	Jan 1, 2009	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 24 pCi/L, federal limit 5 pCi/L (4.8 times the limit)	Jan 1, 2008	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 27 pCi/L, federal limit 15 pCi/L (1.8 times the limit)	Jan 1, 2008	Archived
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 24 pCi/L, federal limit 5 pCi/L (4.8 times the limit)	Jan 1, 2007	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 26 pCi/L, federal limit 15 pCi/L (1.7 times the limit)	Jan 1, 2007	Archived
Total Coliform Contaminant limit exceeded	Sep 1, 1994	Resolved
Total Coliform Contaminant limit exceeded	Aug 1, 1994	Resolved
Total Coliform (acute) Contaminant limit exceeded	Aug 1, 1994	Resolved
Combined Radium (-226 and -228) Contaminant limit exceeded Measured 28 pCi/L, federal limit 5 pCi/L (5.6 times the limit)	Jan 1, 1994	Archived
Gross Alpha, Excl. Radon and U Contaminant limit exceeded Measured 48 pCi/L, federal limit 15 pCi/L (3.2 times the limit)	Jan 1, 1994	Archived
Total Coliform (acute) Contaminant limit exceeded	Jul 1, 1991	Archived

Enforcement actions

Colorado regulators took 3 formal enforcement actions against Patterson Valley WC between 1999 and 2022. The most recent was a compliance order (no penalty) in May 2022.

Date	By	Action	Violations covered
May 31, 2022	Colorado	Compliance order (no penalty)	88 violations (88 health-based): Gross Alpha, Excl. Radon and U, Combined Radium (-226 and -228)
Jan 4, 2018	Colorado	Compliance order (no penalty)	34 violations (34 health-based): Combined Radium (-226 and -228), Gross Alpha, Excl. Radon and U
Nov 26, 1999	Colorado	Compliance order (no penalty)	22 violations (22 health-based): Gross Alpha, Excl. Radon and U, Combined Radium (-226 and -228)

What the violations mean

Gross Alpha, Excl. Radon and U

34 incidents

Test results for Gross Alpha, Excl. Radon and U were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Combined Radium (-226 and -228)

34 incidents

Test results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Where the water comes from

Patterson Valley WC draws water from 1 well.

Annual water quality report

Patterson Valley WC 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 Patterson Valley WC 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

Lead pipes

Total service lines reported	42
Lead pipes confirmed	0
Galvanized pipes needing replacement	0
Pipes with unknown material	0
Non-lead pipes confirmed	42
Pipes that may be lead or unknown	0.0% (0)
Inventory submitted	Submission on record
EPA reporting status	Reported all required service line types

Plumbing inside a home built before 1986 can still contain lead.

Verify on EPA SDWIS EPA Get the Lead Out guidance