Water Quality in Dos Palos, CA: 16 Violations — Grade C
Grade C · Score 55/100 · 1 water system · Updated 2026-05-03
Dos Palos's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
The compliance record maintained by the EPA for Dos Palos, CA documents 16 water violations — each tied to a specific public water system and assigned a violation category in the federal Safe Drinking Water dataset.
Water Quality by ZIP Code in Dos Palos
Water quality varies across Dos Palos's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93620 | C | 55 | 16 | 15 | View report → |
Violation Trend
EPA violations recorded for water systems serving Dos Palos.
Water Quality Overview
Dos Palos, California receives a water quality grade of C with an overall score of 55 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Dos Palos have accumulated 16 EPA violations, including 15 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 7,452 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Dos Palos's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for Dos Palos is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 68% of homes built before 1986, Dos Palos 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 Dos Palos
Dos Palos is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 7,452 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 2 enforcement actions against water systems serving Dos Palos. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Dos Palos
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 Dos Palos Water Systems
The following contaminants have been detected or caused violations across Dos Palos's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 14 | 1 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 1 | 1 | Yes |
| Stage 1 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
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 Dos Palos:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 3 | 3 |
| 2022 | 4 | 4 |
| 2023 | 2 | 2 |
| 2024 | 2 | 2 |
| 2025 | 3 | 3 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Dos Palos. Recent actions:
| Date | Action Type |
|---|---|
| 2023-02-02 | State Filed Suit |
| 2021-03-19 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2023-02-02.
Dos Palos vs. Nearby California Cities
How Dos Palos's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Dos Palos | C | 16 | 1 | 7,452 |
| South Dos Palos | C | 0 | 1 | 7,452 |
| Escalon | A | 0 | 1 | 7,429 |
| Fowler | B | 1 | 2 | 7,494 |
Common Questions About Dos Palos Water
These are the most common questions residents search for about water quality in Dos Palos, California:
Is Dos Palos water hard or soft? Water hardness varies by source. Dos Palos's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Dos Palos tap water? Dos Palos's water receives a grade of C (55/100). There are 15 health-based violations — consider filtration.
What is the best water filter for Dos Palos? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Dos Palos vs. California Average
Understanding how Dos Palos 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 Dos Palos.
ZIP Codes in Dos Palos
Dos Palos spans 1 ZIP code. The ZIP with the lowest water quality score is 93620. 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.