Alhambra, CA Water Safety: 83/100 (2026)
7 ZIP codes · 7 water systems · Updated 2026-06-03
Looking at federal monitoring data for Alhambra, 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 Alhambra Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Alhambra, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Alhambra.
Alhambra Water: The Quick Version
- Average lead level: 0.0018 mg/L.
- Estimated remediation: $814 per household.
- CDC health risk index: 10.71.
Water Systems Serving Alhambra
Federal drinking water records identify 7 systems in Alhambra, CA. The leading 3 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 7 ZIP codes in Alhambra, California (population ~81,533), covering 7 community water systems serving approximately 454,508 people region-wide.
No EPA violations recorded across any ZIP codes in Alhambra — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Alhambra: B (83/100)
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
Alhambra water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0018 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): 7 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 |
|---|---|---|---|
| 91801 | B | City of Alhambra | 79,776 |
| 91802 | B | Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 |
| 91803 | B | City of Alhambra | 79,776 |
| 91804 | B | Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 |
| 91841 | B | Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 |
| 91896 | B | Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 |
| 91899 | B | Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 |
All ZIP Codes in Alhambra
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.
CDC Health Data for Alhambra
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
Alhambra: Remediation Cost in Perspective
Placing remediation in the context of Alhambra's property market, the equity share is low — most homeowners here are weighing a financial commitment that fits comfortably within routine property planning, far from the threshold where remediation becomes a material equity decision rather than a standard upkeep consideration.
Remediation costs in Alhambra are relatively low compared to home values. The $271–$1,429 estimated range is a small fraction of median property value. Home values are 13% above the California average.
Protecting Children from Lead in Alhambra
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 Alhambra 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.
Climate-Related Water Risk for Alhambra
Flood exposure in Alhambra is meaningful by NFIP measures — 11 claims on record and 29% of ZIP codes carrying FEMA flood zone designations. That level of activity makes flood history a relevant factor when evaluating local water quality over time.
Alhambra has a moderate flood history with 11 FEMA claims averaging $2,374 per payout. 29% 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>$814</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 Alhambra, CA