Montclair, CA Water Safety: 72/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Montclair tap water earns a high safety grade — above-average compliance with CA and federal standards.
How Montclair Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Montclair Water
- Homes built before 1986: 74% — older plumbing may contain lead solder.
- Estimated remediation: $1,000 per household.
- CDC health risk index: 11.58.
Who Supplies Your Water in Montclair
Water delivery in Montclair, CA is handled by 2 utilities rather than a single system — drawn from 2 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 1 ZIP code in Montclair, California (population ~37,515), covering 2 community water systems serving approximately 241,027 people region-wide.
No EPA violations recorded across any ZIP codes in Montclair — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Montclair: B (72/100)
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
Montclair water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Montclair
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91763 | B | Monte Vista Water District | 56,017 |
All ZIP Codes in Montclair
- 91763 [B]
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 Montclair
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
Housing & Infrastructure in Montclair
With 74% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Heavily weighted toward older construction, Montclair's housing stock carries a median build year of 1961. That profile puts a majority of homes in the era when lead-soldered copper plumbing was standard practice.
Over half of homes in Montclair were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Montclair Homeowners
At current valuations, Montclair sits in the low remediation-share tier — the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Montclair are relatively low compared to home values. The $400–$1,600 estimated range is a small fraction of median property value. Home values are 26% below the California average.
Lead Exposure Risk for Children in Montclair
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.
When older housing represents 74% of the local inventory or aggregate readings approach the federal action level, an in-home check becomes the standard way to translate citywide averages into the specific reality of an individual Montclair address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Montclair, CA