Water Quality in Mill Valley, CA: No Violations — Grade C
Grade C · Score 64/100 · 1 water system · Updated 2026-05-03
Mill Valley'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
Mill Valley, CA has zero reported violations — 1 water system, all compliant.
Water Quality by ZIP Code in Mill Valley
Water quality varies across Mill Valley's 2 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 94941 | C | 55 | 0 | 0 | View report → |
| 94942 | B | 73 | 0 | 0 | View report → |
Water Quality Overview
Mill Valley, California receives a water quality grade of C with an overall score of 64 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 1 water system serving Mill Valley. 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 C Means
A grade of C indicates moderate compliance issues. Mill Valley'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 Mill Valley is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 87% of homes built before 1986, Mill Valley 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 Mill Valley
Mill Valley is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 186,895 people across 2 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
How to Check Your Water in Mill Valley
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
Mill Valley vs. Nearby California Cities
How Mill Valley's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Mill Valley | C | 0 | 1 | 186,895 |
| Corte Madera | B | 0 | 1 | 186,895 |
| San Quentin | C | 0 | 1 | 186,895 |
| Guasti | D | 0 | 1 | 185,010 |
Common Questions About Mill Valley Water
These are the most common questions residents search for about water quality in Mill Valley, California:
Is Mill Valley water hard or soft? Water hardness varies by source. Mill Valley's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Mill Valley tap water? Mill Valley's water receives a grade of C (64/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Mill Valley? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Mill Valley vs. California Average
Understanding how Mill Valley 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 Mill Valley.
ZIP Codes in Mill Valley
Mill Valley spans 2 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.