SAN LUIS, CO · Costilla County
COSTILLA COUNTY WS Water System
Consumer Confidence Report status
COSTILLA COUNTY WS must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for COSTILLA COUNTY WS.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Colorado’s official records. Always confirm current status with Colorado before making decisions based on this information.
System facts
- System ID (PWSID)
- CO0112300
- System type
- Community Water System
- Population served
- 561
- Service connections
- 396
- Ownership
- local government
- Water source
- groundwater (wells)
COSTILLA COUNTY WS is one of 305 community water systems in Colorado in the 501 to 3,300 people size category, serving 561 people from groundwater.
As of August 1, 2026, its federal record holds 11 entries between 1991 and 2016, all of which EPA lists as closed. Nothing has been added since 2016.
All 11 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves volatile organic chemicals.
Violation history
Monitoring, Regular
—1,2,4-Trichlorobenzene
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—Carbon tetrachloride
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—Trichloroethylene
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—1,1,2-Trichloroethane
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—Tetrachloroethylene
April 1, 2016 – June 30, 2016
ResolvedMonitoring, Regular
—Benzene
January 1, 1991 – March 31, 1991
ArchivedMonitoring, Regular
—Carbon tetrachloride
January 1, 1991 – March 31, 1991
ArchivedMonitoring, Regular
—p-Dichlorobenzene
January 1, 1991 – March 31, 1991
ArchivedMonitoring, Regular
—1,2-Dichloroethane
January 1, 1991 – March 31, 1991
ArchivedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 1991 – March 31, 1991
Archived
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | 1,2,4-Trichlorobenzene | — | Resolved |
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | 1,1,2-Trichloroethane | — | Resolved |
| April 1, 2016 – June 30, 2016 | Monitoring, Regular | Tetrachloroethylene | — | Resolved |
| January 1, 1991 – March 31, 1991 | Monitoring, Regular | Benzene | — | Archived |
| January 1, 1991 – March 31, 1991 | Monitoring, Regular | Carbon tetrachloride | — | Archived |
| January 1, 1991 – March 31, 1991 | Monitoring, Regular | p-Dichlorobenzene | — | Archived |
| January 1, 1991 – March 31, 1991 | Monitoring, Regular | 1,2-Dichloroethane | — | Archived |
| January 1, 1991 – March 31, 1991 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- August 9, 2023State Compliance achieved2 linked violations
- November 2, 2022State Public Notification requested23 linked violations
- January 20, 2021State Compliance achieved22 linked violations
- January 20, 2021State Public Notification requested1 linked violation
- November 13, 2017State Compliance achieved2 linked violations
- November 13, 2017State Compliance achieved2 linked violations
- February 10, 2017State Violation/Reminder Notice3 linked violations
- February 10, 2017State Public Notification requested3 linked violations
- September 16, 2016State Compliance achieved21 linked violations
- July 15, 2016State Public Notification requested22 linked violations
- August 25, 2008State Compliance achieved3 linked violations
- April 22, 1996State Intentional no-action1 linked violation
- March 6, 1995State Intentional no-action1 linked violation
- March 6, 1995State Public Notification requested1 linked violation
- June 26, 1991State Formal Notice of Violation issued7 linked violations
Common questions
Is COSTILLA COUNTY WS required to publish a Consumer Confidence Report?
- Yes. COSTILLA COUNTY WS is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is COSTILLA COUNTY WS’s next Consumer Confidence Report due?
- COSTILLA COUNTY WS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does COSTILLA COUNTY WS have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for COSTILLA COUNTY WS.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
MARTINEZ, SHANTAE
719-672-4100
SAN LUIS, CO 81152