Fontana, CA Water Safety: 72/100 (2026)
5 ZIP codes · 4 water systems · Updated 2026-06-03
Water systems in Fontana, CA serve households with few reported safety events.
How Fontana Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Fontana, 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 Fontana.
Fontana Water: The Quick Version
- Homes built before 1986: 45% — older plumbing may contain lead solder.
- Estimated remediation: $1,000 per household.
- CDC health risk index: 11.58.
Water Systems Serving Fontana
Throughout Fontana, CA, water comes from one of 3 primary utilities out of 4 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 5 ZIP codes in Fontana, California (population ~235,632), covering 4 community water systems serving approximately 556,322 people region-wide.
No EPA violations recorded across any ZIP codes in Fontana — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Fontana: 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
Fontana water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Fontana
- 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): 5 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 |
|---|---|---|---|
| 92331 | B | San Gabriel Valley Wc - Fontana | 237,700 |
| 92334 | B | San Gabriel Valley Wc - Fontana | 237,700 |
| 92335 | B | San Gabriel Valley Wc - Fontana | 237,700 |
| 92336 | B | San Gabriel Valley Wc - Fontana | 237,700 |
| 92337 | B | San Gabriel Valley Wc - Fontana | 237,700 |
All ZIP Codes in Fontana
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 Fontana
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
How Old Is Fontana's Housing Stock?
With 45% 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
A median build year of 1983 in Fontana is characteristic of a mixed-era city where plumbing risk depends heavily on the specific property. Homes built before 1986 may have lead-soldered copper joints; those from before 1970 face the added possibility of lead service lines. The percentages above capture how much of the residential stock falls into each risk era.
Most homes in Fontana were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Fontana: Remediation Cost in Perspective
For most homeowners in Fontana, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in Fontana are relatively low compared to home values. The $400–$1,660 estimated range is a small fraction of median property value. Home values are 30% below the California average.
Protecting Children from Lead in Fontana
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.
Despite citywide averages serving as the standard public reference point, those aggregates cannot resolve what is happening at one specific faucet — and where 45% of Fontana homes come from before the solder rule or where utility samples sit at or above the action mark, the gap between system data and faucet reality matters more than it does in lower-exposure communities. An in-home draw closes that gap, with certified filtration through retailer networks available where confirmed faucet results warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Fontana
Across the NFIP's long tracking period, Fontana shows 23 claims and 40% of ZIP codes within FEMA-designated flood zones — figures that place it in moderate flood exposure territory. At this level, the water-quality implications of flooding — contaminated wells, stressed treatment intake, distribution backflow — move from theoretical edge cases to genuine periodic risks, particularly during higher-severity events.
Fontana has a moderate flood history with 23 FEMA claims averaging $12,967 per payout. 40% 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>$1,000</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 Fontana, CA