Water Quality in Boise, ID: 139 Violations Recorded for Mapped Water Systems
13 water systems · 10 directly mapped ZIP records
Available EPA records report 139 violations across 10 directly mapped ZIP records with known counts for Boise. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Boise
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 83704 | 125 | 3 | View report → |
| 83706 | 125 | 3 | View report → |
| 83709 | 12 | 4 | View report → |
| 83713 | 6 | 4 | View report → |
| 83702 | 2 | 0 | View report → |
| 83703 | 2 | 0 | View report → |
| 83705 | 0 | 0 | View report → |
| 83712 | 0 | 0 | View report → |
| 83716 | 0 | 0 | View report → |
| 83725 | 0 | 0 | View report → |
Water Quality Overview
Boise, Idaho has directly mapped EPA water-system data for 10 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 139 violations, including 7 health-based violations across 10 directly mapped ZIP records with reported counts.
Lead Levels
The average of the reported 90th-percentile lead results across the ZIP codes of Boise is 0.0020 mg/L; the EPA action level of 0.015 mg/L applies to a water system's own 90th-percentile result and is not a safety threshold (EPA's health goal for lead is zero). No exceedances appear among the 10 ZIP records with known lead status.
With 50% of homes built before 1986, Boise has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Boise
Boise is served by 13 community water systems regulated under the Safe Drinking Water Act. About 265,704 people live in the area (32 ZIP codes, Census); this is not the systems' reported service population.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
EPA records list enforcement actions against water systems serving Boise. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Boise
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Boise Water Systems
The following contaminants have been detected or caused violations across Boise's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Combined Uranium | Radionuclides | 0.03 mg/L | 18 | 4 | Yes |
| Atrazine | Organic | 0.003 mg/L | 8 | 2 | No |
| Di(2-ethylhexyl) phthalate | Organic | 0.006 mg/L | 6 | 2 | No |
| Public Notice Rule | Reporting | N/A | 6 | 4 | No |
| Lead and Copper Rule Revisions | Treatment Technique | N/A | 4 | 2 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 3 | 3 | No |
| Nitrate | Inorganic | 10 mg/L | 2 | 2 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 2 | 1 | No |
| Chlorine | Disinfectant | 4 mg/L (MRDL) | 2 | 1 | No |
The standard column shows the EPA Maximum Contaminant Level (MCL) except for lead and copper, whose value is an action level that triggers corrective steps and is not an MCL. Health-based violations are MCL, MRDL and treatment-technique violations.
Violation Trend Over Time
Year-by-year health-based EPA violations recorded for water systems serving Boise (this history covers health-based records only):
| Year | Health-based violations |
|---|---|
| 2024 | 2 |
| 2025 | 4 |
Health-based violations have increased from 2 in 2024 to 4 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken enforcement actions against water systems serving Boise. Recent actions:
| Date | Action Type |
|---|---|
| 2026-02-27 | State Informal Enforcement |
| 2026-02-24 | State Informal Action |
| 2025-11-23 | State Informal Enforcement |
| 2025-11-20 | State Informal Action |
| 2025-09-11 | State Informal Action |
| 2025-08-16 | State Informal Enforcement |
| 2025-08-13 | State Order Extension |
| 2025-08-13 | State Informal Action |
| 2025-07-21 | State Informal Enforcement |
| 2025-07-18 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-02-27.
Boise vs. Nearby Idaho Cities
How Boise's water quality compares to similar cities in Idaho:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Boise | 10 | 139 | 13 | 265,704 |
| Nampa | 3 | 43 | 12 | 136,828 |
| Meridian | 2 | 1 | 3 | 132,571 |
| Idaho Falls | 4 | 66 | 6 | 122,947 |
Water Quality by ZIP Code in Boise
EPA coverage and recorded violations can differ across Boise's ZIP codes. Missing counts are shown as unavailable, not zero:
| ZIP Code | Violations | Health-Based |
|---|---|---|
| 83704 | 125 | 3 |
| 83706 | 125 | 3 |
| 83709 | 12 | 4 |
| 83713 | 6 | 4 |
| 83702 | 2 | 0 |
| 83703 | 2 | 0 |
| 83705 | 0 | 0 |
| 83712 | 0 | 0 |
| 83716 | 0 | 0 |
| 83725 | 0 | 0 |
Common Questions About Boise Water
These are the most common questions residents search for about water quality in Boise, Idaho:
Is Boise water hard or soft? Water hardness varies by source. Boise's 13 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Boise tap water? City-level EPA records cannot determine safety at a specific tap. The measured subset contains 7 health-based violations; check the affected utility record and consider certified testing.
What is the best water filter for Boise? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Boise vs. Idaho Average
Understanding how Boise compares to the broader Idaho average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Boise.
ZIP Codes in Boise
Boise spans 32 ZIP codes. EPA water-system coverage is available for 10 directly mapped ZIP codes. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.