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Water system · PWSID CO0159095

SILVERTHORNE TOWN OF

SILVERTHORNE, CO · ~8,414 people served

Check your exact address → SILVERTHORNE overview
100
Excellent
PurityRadar safety score

PWSID

CO0159095

State

Colorado

City

SILVERTHORNE

Population served

8,414

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

Latest detections from EPA’s UCMR5 monitoring (through Oct 2025). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

3.7 ppt

limit 10 ppt

Below EPA limit

Lithium

24,000 ppt

limit —

No federal limit

PFBS

5.9 ppt

limit —

No federal limit

Violations & enforcement

131

Violations on record

0

Unaddressed

1

Health-based

27

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2025. Official EPA record →

Other · EPA contaminant 7000 began Jul 2025 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2955 began Jan 2020 Resolved
Monitoring & reporting · EPA contaminant 2036 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2035 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2039 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2015 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2020 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2033 began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 2005 began Jan 2011 Resolved

Recent enforcement actions

  • State action · SOX Aug 2025
  • State action · SOX Jul 2025
  • State action · SIE Jul 2025
  • State action · SIA Jul 2025
  • State action · SIE Oct 2024
  • State action · SIA Oct 2024
  • State action · SOX Jun 2021
  • State action · SIA Aug 2020

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest Dec 2024

0.231 · max 0.39 mg/L · 61

Manganese

1 station · latest May 2024

15 · max 46.6 ug/L · 10

Copper

1 station · latest May 2024

1.4 · max 1.7 ug/L · 5

Arsenic

1 station · latest Apr 2024

1 · max 1 ug/L · 3

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CO0159095 — 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.