TapSafetyReport
F0/100

CAPITOL WATER CORP — Water Quality Report 2026

Serving 9,000 people · Idaho

Water Source
Groundwater
County
—
System ID
ID4010022
Violations
85

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
3.56 mg/L1.30 mg/LOver Limit

EPA Violation History

8

Violations (last 5yr)

3

Unresolved

3

Health-Related

TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: September 2, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: April 1, 2025 – June 30, 2025Enforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: January 13, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: January 1, 2025 – March 31, 2025Enforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Reporting violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 17, 2024 – November 15, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Treatment technique violation

When: October 17, 2024 – November 15, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2022 – September 30, 2022Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: April 1, 2022 – June 30, 2022Enforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About CAPITOL WATER CORP

Is CAPITOL WATER CORP water safe to drink?

CAPITOL WATER CORP water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 85 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has CAPITOL WATER CORP detected?

32 contaminants were tested in CAPITOL WATER CORP's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).

Does CAPITOL WATER CORP have any EPA violations?

Yes, CAPITOL WATER CORP has 85 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MCL, RPT. 6 are health-based violations.

How many people does CAPITOL WATER CORP serve?

CAPITOL WATER CORP serves approximately 9,000 people, Idaho.

What type of water does CAPITOL WATER CORP provide?

CAPITOL WATER CORP sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is ID4010022.

How does CAPITOL WATER CORP compare to other utilities in Idaho?

CAPITOL WATER CORP scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Idaho state page for a full comparison of water systems.