COSTILLA COUNTY WS
Colorado — Community Water System — PWSID: CO0112300
System Information
| PWSID | CO0112300 |
| System Name | COSTILLA COUNTY WS |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 20, 1979 |
| Last Reported | Feb 23, 2026 |
Location & Contact
| State | Colorado |
| City | SAN LUIS |
| ZIP Code | 81152 |
| Address | — |
| Organization | MARTINEZ, SHANTAE |
| Phone | 719-672-4100 |
Population & Service
| Population Served | 561 |
| Service Connections | 396 |
Drinking Water Violations (116)
This water system has 116 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.006 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Oct 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.006 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Oct 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.006 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 15 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 15 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 15 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.2 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.2 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.2 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.007 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.007 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.007 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.07 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.07 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.07 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 10 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 10 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 10 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 1 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.6 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.6 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.6 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.07 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.07 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Jun 30, 2016 | — |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.