Water Quality in Wishon, CA: 6 Violations — Grade F
Grade F · Score 35/100 · 1 water system · Updated 2026-05-03
Wishon's water has serious compliance issues. Independent testing and filtration are strongly recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Wishon, CA — 6 compliance events documented in the federal drinking water record.
Water Quality by ZIP Code in Wishon
Water quality varies across Wishon's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93669 | F | 35 | 6 | 5 | View report → |
Violation Trend
EPA violations recorded for water systems serving Wishon.
Water Quality Overview
Wishon, California receives a water quality grade of F with an overall score of 35 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Wishon have accumulated 6 EPA violations, including 5 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 42 people.
What Grade F Means
A grade of F indicates serious compliance issues. Wishon's water systems have substantial violations. Residents should strongly consider independent water testing and appropriate filtration.
Lead Levels
The average 90th percentile lead level across Wishon water systems is 0.0120 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 64% of homes built before 1986, Wishon 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.
Radon Risk
Wishon is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Wishon
Wishon is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 42 people across 1 ZIP codes.
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
The EPA has taken 4 enforcement actions against water systems serving Wishon. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Wishon
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
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 Wishon Water Systems
The following contaminants have been detected or caused violations across Wishon's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Combined Radium | Radionuclides | 5 pCi/L | 5 | 1 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Wishon:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2023 | 2 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 2 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 4 enforcement actions against water systems serving Wishon. Recent actions:
| Date | Action Type |
|---|---|
| 2025-05-12 | State Filed Judgment |
| 2025-05-12 | State Order Extension |
| 2024-01-19 | State Filed Judgment |
| 2021-03-17 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-05-12.
Wishon vs. Nearby California Cities
How Wishon's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Wishon | F | 6 | 1 | 42 |
| Bass Lake | C | 0 | 1 | 42 |
| Darwin | B | 3 | 1 | 40 |
| Olancha | D | 0 | 1 | 40 |
Common Questions About Wishon Water
These are the most common questions residents search for about water quality in Wishon, California:
Is Wishon water hard or soft? Water hardness varies by source. Wishon's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Wishon tap water? Wishon's water receives a grade of F (35/100). There are 5 health-based violations — consider filtration.
What is the best water filter for Wishon? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Wishon vs. California Average
Understanding how Wishon compares to the broader California 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 Wishon.
ZIP Codes in Wishon
Wishon spans 1 ZIP code. The ZIP with the lowest water quality score is 93669. Each ZIP code has its own water quality profile based on the specific water system serving that area. 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
Updated daily.