Oroville, CA: 2 Health Violations — 86/100 (2026)
2 ZIP codes · 7 water systems · Updated 2026-06-03
Across Oroville, EPA monitoring data shows low violation rates and healthy safety margins — a pattern that places the city well above CA's average for drinking water compliance across recent reporting cycles.
How Oroville Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Oroville Water
- Your city's water systems recorded 20 violations in the past 5 years.
- Average lead level: 0.0052 mg/L.
- Homes built before 1986: 70% — older plumbing may contain lead solder.
- Estimated remediation: $2,650 per household.
- CDC health risk index: 12.05 — above typical levels.
Who Supplies Your Water in Oroville
In Oroville, CA, residential water supply is distributed across multiple utilities rather than concentrated in one. The 3 leading providers out of 7 tracked systems each control their own infrastructure, file separate EPA compliance reports, and set independent rate schedules.
Overview
We track water quality and home safety data for 2 ZIP codes in Oroville, California, covering 7 community water systems serving approximately 50,189 people.
2 of 2 ZIP codes (100%) have recorded EPA violations. 2 health-based violations documented.
Home Safety Score
Average Home Safety Score for Oroville: A (86/100)
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
Oroville water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0052 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 2 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 15 | 2 |
| Stage 2 DBP Rule | Treatment Technique | 6 | 2 |
| Surface Water Treatment Rule | Treatment Technique | 6 | 2 |
| Stage 1 DBP Rule | Treatment Technique | 3 | 2 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 95965 | A | 10 | 1 | South Feather W&p - Miners Ranch |
| 95966 | A | 10 | 1 | South Feather W&p - Miners Ranch |
All ZIP Codes in Oroville
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 Oroville
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
Top Contaminants in Oroville Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Oroville
With 70% 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
Viewed through the lens of construction era, Oroville is predominantly an older city — a median build year of 1975 puts most of the residential inventory in the range where pre-1986 plumbing materials were the standard.
Over half of homes in Oroville 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 Oroville Homeowners
Property equity in Oroville runs well ahead of estimated remediation costs — a cost-to-value ratio that sits in the low tier, meaning documented water and safety issues here are the kind homeowners can plan to address without treating the expense as a significant budget event relative to what their homes are worth.
Remediation costs in Oroville are relatively low compared to home values. The $1,700–$3,900 estimated range is a small fraction of median property value. Home values are 58% below the California average.
Lead Exposure Risk for Children in Oroville
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.
Pulling a tap sample fills the gap that utility data cannot close, particularly here where 70% of housing dates from the pre-rule era and citywide monitoring sits at or above the regulatory mark in Oroville.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Oroville
FEMA data shows 100% of Oroville's ZIP codes mapped into designated flood zones, paired with an NFIP record of 59 claims. That footprint places local flood exposure in the range where it warrants attention without rising to high-severity planning territory.
Oroville has a moderate flood history with 59 FEMA claims averaging $25,171 per payout. 100% 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>$2,650</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 Oroville, CA