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Water system · PWSID CO0107152

BOULDER CITY OF

BOULDER, CO · ~166,080 people served

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

PWSID

CO0107152

State

Colorado

City

BOULDER

Population served

166,080

Primary source

Surface water

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

8

Violations on record

0

Unaddressed

3

Health-based

26

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2024. Official EPA record →

Monitoring & reporting · EPA contaminant 0300 began Oct 2024 Resolved
Monitoring & reporting · EPA contaminant 0200 began Jun 2022 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2017 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 0200 began Jan 2017 Resolved
Monitoring & reporting · EPA contaminant 0200 began Dec 2016 Resolved
Monitoring & reporting · EPA contaminant 0200 began Oct 2016 Resolved
Treatment technique · EPA contaminant 0300 health-based began Jan 2010 Resolved

Recent enforcement actions

  • State action · SOX Dec 2024
  • State action · SIA Nov 2024
  • State action · SIE Nov 2024
  • State action · SIF Mar 2023
  • State action · SOX Aug 2022
  • State action · SIE Jul 2022
  • State action · SIA Jul 2022
  • State action · SOX Dec 2017

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

Manganese

2 stations · latest Dec 2024

7.4 · max 45.2 ug/L · 71

Copper

1 station · latest Nov 2024

0.9 · max 4.5 ug/L · 34

Arsenic

2 stations · latest Nov 2024

0 · max 2 ug/L · 31

Nitrate

1 station · latest Dec 2023

8.21 · max 46.4 mg/L · 24

Lead

1 station · latest Jun 2023

0 · max 3 ug/L · 23

Fluoride

1 station · latest May 2022

0.169 · max 0.196 mg/L · 2

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 CO0107152 — 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.