TapGraded
F

CAPITOL WATER CORP

Boise, ID · 9,000 served

CAPITOL WATER CORP serves 9,000 people in Boise, ID. It has 3 health-based violations in the last 5 years. TapGraded gives this system an F.

Score breakdown

Health-based violations (5y)

3

Monitoring violations (5y)

121

Currently unaddressed

0

Overall score

46/100

Violation history (last 5 years)

2023
2024
2025
Health-based Monitoring / reporting

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Lead (Lead and Copper Rule)

EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).

90th-percentile lead sample 0 ppb
0 ppb EPA action level: 15 ppb

PFAS (UCMR5 occurrence data)

HFPO-DA (not detected) 0 ppt
0 ppt EPA MCL: 10 ppt
PFOS 9.8 ppt over limit
0 ppt EPA MCL: 4 ppt
PFOA 5.9 ppt over limit
0 ppt EPA MCL: 4 ppt
PFNA 51 ppt over limit
0 ppt EPA MCL: 10 ppt
PFHxS 5.5 ppt
0 ppt EPA MCL: 10 ppt

System details

System type
Community water system
Water source
Ground water
Ownership
Private
Service connections
2,811

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Frequently asked questions

Is Boise, ID tap water safe to drink?

CAPITOL WATER CORP has 3 health-based violations in the last 5 years. TapGraded gives this system an F.

Does CAPITOL WATER CORP have lead in its water?

The most recent 90th-percentile lead sample is 0 ppb, versus the EPA action level of 15 ppb.

Has PFAS been detected in CAPITOL WATER CORP's water?

Yes — PFAS was detected at or above the EPA MCL for 3 of the tracked analytes.

Source: EPA SDWIS/ECHO · Data as of 2026Q2