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Water system · PWSID CO0112300

COSTILLA COUNTY WS

SAN LUIS, CO · ~561 people served

Check your exact address → SAN LUIS overview
100
Excellent
PurityRadar safety score

PWSID

CO0112300

State

Colorado

City

SAN LUIS

Population served

561

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

36

Violations on record

0

Unaddressed

2

Health-based

40

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2023. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2022 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2022 Resolved
Monitoring & reporting · EPA contaminant 2039 began Oct 2020 Resolved
Monitoring & reporting · Gross alpha began Oct 2016 Resolved
Monitoring & reporting · Uranium began Oct 2016 Resolved
Monitoring & reporting · EPA contaminant 2976 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2968 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2980 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2378 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2955 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2380 began Apr 2016 Resolved
Monitoring & reporting · EPA contaminant 2979 began Apr 2016 Resolved

Recent enforcement actions

  • State action · SOX Aug 2023
  • State action · SIA Nov 2022
  • State action · SIE Nov 2022
  • State action · SIA Jan 2021
  • State action · SOX Jan 2021
  • State action · SIE Jan 2021
  • State action · SOX Nov 2017
  • State action · SOX Nov 2017

This profile is built from EPA public records for system CO0112300 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.