Home/ Directory/ ID/ CAPITOL WATER CORP

Water system · PWSID ID4010022

CAPITOL WATER CORP

BOISE, ID · ~9,000 people served

Check your exact address → BOISE overview
38
Action needed
PurityRadar safety score

PWSID

ID4010022

State

Idaho

City

BOISE

Population served

9,000

Primary source

Groundwater

Score history

▼ 62 points — the score moved from 100 to 38 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 38

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 Dec 2023). Levels in parts per trillion (ppt).

PFNA

Perfluorononanoic acid

51 ppt

limit 10 ppt

Above EPA limit · 5.1×

PFOS

Perfluorooctanesulfonic acid

9.8 ppt

limit 4 ppt

Above EPA limit · 2.4×

PFOA

Perfluorooctanoic acid

5.7 ppt

limit 4 ppt

Above EPA limit · 1.4×

PFHxS

Perfluorohexanesulfonic acid

5.1 ppt

limit 10 ppt

Near EPA limit

Lithium

15,000 ppt

limit —

No federal limit

PFPeA

5.4 ppt

limit —

No federal limit

PFHxA

5.2 ppt

limit —

No federal limit

PFBS

3.9 ppt

limit —

No federal limit

Violations & enforcement

49

Violations on record

1

Unaddressed

2

Health-based

45

Enforcement actions

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

Other · EPA contaminant 7500 began Sep 2025 Unaddressed
Other · EPA contaminant 7500 began Jan 2025 Resolved
Reporting · EPA contaminant 5200 began Oct 2024 Resolved
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved
Monitoring & reporting · Combined radium-226/228 began Jul 2022 Resolved
Monitoring & reporting · Combined radium-226/228 began Apr 2022 Resolved
Monitoring · Lead & Copper Rule began Aug 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2017 Resolved
Other · EPA contaminant 7500 began Feb 2014 Resolved
Treatment technique · EPA contaminant 0700 health-based began Jan 2014 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2010 Resolved
Monitoring & reporting · Nitrate began Jan 2009 Resolved

Recent enforcement actions

  • State action · SIE Nov 2025
  • State action · SIA Nov 2025
  • State action · SIE Mar 2025
  • State action · SIA Mar 2025
  • State action · SIF Jan 2025
  • State action · SOX Jan 2025
  • State action · SOX Dec 2024
  • State action · SIE Nov 2024

This profile is built from EPA public records for system ID4010022 — 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.