Menlo Park, CA Water Safety: 78/100 (2026)
2 ZIP codes · 3 water systems · Updated 2026-06-03
Looking at federal monitoring data for Menlo Park, CA: the city clears benchmarks set under the Safe Drinking Water Act with room to spare — recorded exceedances are rare, and the systems serving local households have not triggered any pattern of repeat deficiencies in recent cycles.
How Menlo Park Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Menlo Park Water
- Average lead level: 0.0031 mg/L.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 9.58.
Who Supplies Your Water in Menlo Park
Menlo Park, CA is covered by 3 major water utilities out of 3 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
Overview
We track water quality and home safety data for 2 ZIP codes in Menlo Park, California, covering 3 community water systems serving approximately 40,230 people.
No EPA violations recorded across any ZIP codes in Menlo Park — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Menlo Park: B (78/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Menlo Park water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0031 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 2 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94025 | B | Menlo Park Municipal Water | 22,362 |
| 94026 | B | Menlo Park Municipal Water | 22,362 |
All ZIP Codes in Menlo Park
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
Updated daily.
Health Outcomes in Menlo Park
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Menlo Park Homeowners
At current valuations, Menlo Park sits in the low remediation-share tier — the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Menlo Park are relatively low compared to home values. The $1,200–$2,500 estimated range is a small fraction of median property value. Home values are 171% above the California average.
Lead Exposure Risk for Children in Menlo Park
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Menlo Park appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Menlo Park
Over the multi-decade window covered by the National Flood Insurance Program, Menlo Park has accumulated 57 claims — a total that suggests more than isolated flood exposure. With 50% of ZIP codes in designated flood zones, the water-quality implications of flooding move from hypothetical to periodically relevant: treatment intake can be compromised, wells can be infiltrated, and distribution backflow can occur.
Menlo Park has a moderate flood history with 57 FEMA claims averaging $27,904 per payout. 50% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Menlo Park, CA