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COSTILLA COUNTY WS

Colorado — Community Water System — PWSID: CO0112300

System Information

PWSIDCO0112300
System NameCOSTILLA COUNTY WS
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedMar 20, 1979
Last ReportedNov 17, 2025

Location & Contact

StateColorado
CitySAN LUIS
ZIP Code81152
Address—
OrganizationMARTINEZ, SHANTAE
Phone719-672-4100

Population & Service

Population Served561
Service Connections396

Drinking Water Violations (114)

This water system has 114 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 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Dec 31, 2022 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Dec 31, 2022 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Dec 31, 2022 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Dec 31, 2022 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Dec 31, 2022 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 Dec 31, 2020 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Dec 31, 2020 Synthetic Organic Chemicals
Oct 1, 2020 Dec 31, 2020 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Dec 31, 2020 Synthetic Organic Chemicals
Oct 1, 2020 Dec 31, 2020 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Dec 31, 2020 Synthetic Organic Chemicals
Oct 1, 2016 Dec 31, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2016 Dec 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2016 Dec 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2016 Dec 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2016 Dec 31, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2016 Dec 31, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Apr 1, 2016 Jun 30, 2016 Benzene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Benzene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Toluene MR No Yes — 1 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Toluene MR No Yes — 1 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Xylenes, Total MR No Yes — 10 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Xylenes, Total MR No Yes — 10 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Xylenes, Total MR No Yes — 10 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Benzene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Toluene MR No Yes — 1 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals
Apr 1, 2016 Jun 30, 2016 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Jun 30, 2016 Volatile Organic Chemicals

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.

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