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Water system · PWSID CO0107471

LEFT HAND WD

NIWOT, CO · ~20,280 people served

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

PWSID

CO0107471

State

Colorado

City

NIWOT

Population served

20,280

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

69

Violations on record

0

Unaddressed

1

Health-based

28

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2019. Official EPA record →

Monitoring & reporting · EPA contaminant 0100 began Nov 2017 Resolved
Monitoring & reporting · EPA contaminant 3014 began Nov 2017 Resolved
Monitoring & reporting · EPA contaminant 3015 began Nov 2017 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2015 Resolved
Monitoring & reporting · Nitrate began Jan 2013 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2020 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2005 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2036 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2035 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2037 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2015 began Jan 2005 Resolved

Recent enforcement actions

  • State action · SOX Dec 2019
  • State action · SIA Dec 2019
  • State action · SIE Dec 2019
  • State action · SIF Feb 2019
  • State action · SOX May 2018
  • State action · SIA May 2018
  • State action · SIE May 2018
  • State action · SIE May 2018

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

6 stations · latest Dec 2024

3.64 · max 23.5 mg/L · 306

Manganese

2 stations · latest Feb 2025

27.9 · max 393 ug/L · 123

Copper

1 station · latest Nov 2024

1.8 · max 11.2 ug/L · 69

Arsenic

2 stations · latest Nov 2024

0 · max 8 ug/L · 43

Lead

2 stations · latest Jun 2024

0.614 · max 9 ug/L · 40

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 CO0107471 — 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.