Capitol Water Corporation
EPA ID: ID4010022 · 9,000 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Capitol Water Corporation (ID4010022): 1 unresolved EPA violation on record. Within the EPA compliance database, Capitol Water Corporation shows 1 violation still pending resolution - a status that applies across the full service territory of approximately 9,000 people and reflects findings that have not yet cleared the federal enforcement process or received formal closure.
Data: EPA SDWIS
Service Area Map
Coverage area for Capitol Water Corporation Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Capitol Water Corporation serves a community with a median household income of $81,101 and an estimated 104,578 residents across its service area. Approximately 48% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Capitol Water Corporation's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Detected Contaminants
How Capitol Water Corporation compares to EPA limits
What This Means For You
Contaminant 2015 at 4 mg/L exceeds the EPA maximum of 0.0005 mg/L. Probable carcinogen; liver & thyroid damage, immune suppression. Consider granular activated carbon (GAC) filtration.
Atrazine at 3 mg/L exceeds the EPA maximum of 0.003 mg/L. Endocrine disruption, cardiovascular & reproductive effects. Consider granular activated carbon (GAC) filtration.
Benzene at 4 mg/L exceeds the EPA maximum of 0.005 mg/L.
Contaminant 2110 at 4 mg/L exceeds the EPA maximum of 0.005 mg/L. Leukemia & blood cancers (known carcinogen). Consider granular activated carbon (GAC) filtration.
Lead at 1 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 14 detections recorded. 5 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Contaminant 2015 was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Idaho
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Capitol Water Corporation (EPA ID: ID4010022) is a community water system in Idaho that serves approximately 9,000 people from groundwater sources.
This system provides water to 3 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 5 resolved, 118 archived, 0 addressed, and 1 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 2, 2025 | Lead and Copper Rule | Non-health-based | Unaddressed (current) |
| April 1, 2025 | Combined Radium | Health-based | Archived |
| January 13, 2025 | Lead and Copper Rule | Non-health-based | Resolved |
| January 1, 2025 | Combined Radium | Health-based | Archived |
| January 1, 2025 | Lead | Non-health-based | Archived |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Non-health-based | Resolved |
| January 1, 2023 | Contaminant 2959 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2946 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2931 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2383 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2326 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2306 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2274 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2110 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2105 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2067 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2065 | Non-health-based | Archived |
| January 1, 2023 | Contaminant 2051 | Non-health-based | Archived |
| January 1, 2023 | Benzene | Non-health-based | Archived |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Contaminant 2005 | Other Violation | 4 | No |
| Contaminant 2010 | Other Violation | 4 | No |
| Contaminant 2015 | Other Violation | 4 | No |
| Contaminant 2020 | Other Violation | 4 | No |
| Contaminant 2031 | Other Violation | 4 | No |
| Contaminant 2032 | Other Violation | 4 | No |
| Contaminant 2033 | Other Violation | 4 | No |
| Contaminant 2034 | Other Violation | 4 | No |
| Contaminant 2035 | Other Violation | 4 | No |
| Contaminant 2036 | Other Violation | 4 | No |
| Contaminant 2037 | Other Violation | 4 | No |
| Contaminant 2040 | Other Violation | 4 | No |
| Contaminant 2041 | Other Violation | 4 | No |
| Contaminant 2042 | Other Violation | 4 | No |
| Contaminant 2046 | Other Violation | 4 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by ID or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Capitol Water Corporation (ID4010022) on EPA.gov.
Frequently Asked Questions
Is Capitol Water Corporation water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current noncompliance record and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.
How many people does Capitol Water Corporation serve?
Capitol Water Corporation serves approximately 9,000 people across 3 ZIP codes in Idaho.
Where does Capitol Water Corporation get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Above Current MCL
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS compounds were measured above the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Capitol Water Corporation (ID): 3 Health Violations. https://zipcheckup.com/water-system/id4010022/
@misc{zipcheckup-water-system-id4010022,
author = {{ZipCheckup}},
title = {{Capitol Water Corporation (ID): 3 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/id4010022/}
}
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Capitol Water Corporation (EPA ID: ID4010022) - request the latest Consumer Confidence Report or ask about specific contaminants.