Water Quality in Rohnert Park, CA: No Violations — Grade A
Grade A · Score 94/100 · 5 water systems · Updated 2026-05-03
Rohnert Park's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
When EPA compliance data is reviewed for Rohnert Park, CA, the result holds consistent: zero violations documented across 5 tracked water systems, with every health-based limit and monitoring requirement met through the full dataset available in SDWIS.
Water Quality by ZIP Code in Rohnert Park
Water quality varies across Rohnert Park's 3 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 94928 | A | 92 | 0 | 0 | View report → |
| 94926 | A | 95 | 0 | 0 | View report → |
| 94927 | A | 95 | 0 | 0 | View report → |
Water Quality Overview
Rohnert Park, California receives a water quality grade of A with an overall score of 94 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 5 water systems serving Rohnert Park. This is a positive indicator, though it does not guarantee the absence of all contaminants — some substances (like PFAS) are not yet fully regulated.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Rohnert Park's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across Rohnert Park water systems is 0.0061 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 63% of homes built before 1986, Rohnert Park 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 Rohnert Park
Rohnert Park is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 54,959 people across 3 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 15 enforcement actions against water systems serving Rohnert Park. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Rohnert Park
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
EPA Enforcement History
The EPA and state regulators have taken 5 enforcement actions against water systems serving Rohnert Park. Recent actions:
| Date | Action Type |
|---|---|
| 2024-03-08 | State Order Extension |
| 2021-09-10 | State Filed Suit |
| 2021-09-08 | State Filed Suit |
| 2021-02-08 | State Filed Suit |
| 2021-01-13 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-03-08.
Rohnert Park vs. Nearby California Cities
How Rohnert Park's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Rohnert Park | A | 0 | 5 | 54,959 |
| Camp Pendleton | A | 1 | 2 | 54,870 |
| Ceres | C | 7 | 3 | 54,751 |
| Paramount | B | 0 | 1 | 55,200 |
Water Quality by ZIP Code in Rohnert Park
Water quality varies across Rohnert Park's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
Common Questions About Rohnert Park Water
These are the most common questions residents search for about water quality in Rohnert Park, California:
Is Rohnert Park water hard or soft? Water hardness varies by source. Rohnert Park's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Rohnert Park tap water? Rohnert Park's water receives a grade of A (94/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Rohnert Park? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Rohnert Park vs. California Average
Understanding how Rohnert Park 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 Rohnert Park.
ZIP Codes in Rohnert Park
Rohnert Park spans 3 ZIP codes. 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.