Pomona, CA: 10 Health Violations — 77/100 (2026)
5 ZIP codes · 8 water systems · Updated 2026-06-03
How does Pomona tap water hold up under EPA scrutiny? Above average for CA — documented violations are uncommon and the safety grade reflects a clean overall record.
How Pomona Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Pomona, 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 Pomona.
Pomona Water: The Quick Version
- Your city's water systems recorded 20 violations in the past 5 years.
- Average lead level: 0.0021 mg/L.
- Homes built before 1986: 78% — older plumbing may contain lead solder.
- Estimated remediation: $1,540 per household.
- CDC health risk index: 10.71.
Water Systems Serving Pomona
Residential water service in Pomona, CA is divided among 3 separate utilities, drawn from 8 systems on file with federal regulators.
Overview
We track water quality and home safety data for 5 ZIP codes in Pomona, California (population ~153,902), covering 8 community water systems serving approximately 409,589 people region-wide.
5 of 5 ZIP codes (100%) have recorded EPA violations. 10 health-based violations documented.
Home Safety Score
Average Home Safety Score for Pomona: B (77/100)
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
Pomona water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0021 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): 5 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | 12 | 5 |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 6 | 5 |
| Total Organic Carbon | Disinfection Byproducts | 6 | 5 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 91766 | B | 4 | 2 | Pomona - City, Water Department |
| 91767 | B | 4 | 2 | Pomona - City, Water Department |
| 91768 | B | 4 | 2 | Pomona - City, Water Department |
| 91769 | B | 4 | 2 | Pomona - City, Water Department |
| 91797 | B | 4 | 2 | Pomona - City, Water Department |
All ZIP Codes in Pomona
- 91766 [B] — 4 violations ⚠
- 91767 [B] — 4 violations ⚠
- 91768 [B] — 4 violations ⚠
- 91769 [B] — 4 violations ⚠
- 91797 [B] — 4 violations ⚠
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 Pomona
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
Key Contaminants Detected in Pomona
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Pomona's Housing Stock?
With 78% 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
While newer cities carry lower aggregate plumbing risk from lead-era construction, Pomona sits firmly in the older category. The median build year of 1965 indicates that more than half the housing stock was built before 1986, when lead solder was still legally used in residential copper plumbing — and a substantial portion likely predates 1970, when lead pipes were still commonly installed for service lines. These two thresholds together define the elevated plumbing risk environment that older housing cities carry, independent of what the municipal water supply delivers to the meter.
Over half of homes in Pomona 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.
Pomona: Remediation Cost in Perspective
When remediation costs are measured against Pomona home values, the resulting ratio is in the low tier — addressing documented water and safety issues here claims only a minor fraction of typical equity, and most homeowners are in a position where the financial commitment is straightforward rather than a material burden on their household budget.
Remediation costs in Pomona are relatively low compared to home values. The $710–$2,600 estimated range is a small fraction of median property value. Home values are 23% below the California average.
Protecting Children from Lead in Pomona
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.
Although utility-side compliance with federal Lead and Copper requirements remains the system reference, that compliance does not extend down into interior plumbing. With 78% of Pomona stock built before the solder ban and aggregate readings at or beyond the action mark, a household-level sample becomes the practical way to close that information gap.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Pomona
Pomona's flood exposure sits in the moderate range: 8 NFIP claims on record and 40% of ZIP codes within FEMA-designated flood zones. Residents with private wells or older infrastructure have reasonable grounds to factor flood timing into their water quality awareness.
Pomona has a moderate flood history with 8 FEMA claims averaging $6,842 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>$1,540</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 Pomona, CA