Monrovia, CA: 2 Violations — 69/100 (2026)
2 ZIP codes · 4 water systems · Updated 2026-06-03
Across Monrovia, EPA compliance data for CA sits at a moderate level — not alarming, but not uniformly clean across all service areas either.
How Monrovia Compares
Data: EPA SDWIS Last verified: 2026-06-03
Monrovia Water: The Quick Version
- Your city's water systems recorded 2 violations in the past 5 years.
- Estimated remediation: $1,300 per household.
- CDC health risk index: 10.71.
Water Systems Serving Monrovia
Across Monrovia, CA, residential water comes from 3 primary utilities rather than a single consolidated provider. Each system operates independently — managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 4 water systems in the area, with these top providers accounting for the majority of residential connections.
Overview
We track water quality and home safety data for 2 ZIP codes in Monrovia, California (population ~41,710), covering 4 community water systems serving approximately 141,137 people region-wide.
2 of 2 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Monrovia: C (69/100)
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
Monrovia water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Monrovia
- 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): 2 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 |
|---|---|---|---|
| Lead | Inorganic | 3 | 2 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 91016 | C | 1 | 0 | Monrovia-city, Water Department |
| 91017 | B | 1 | 0 | Monrovia-city, Water Department |
All ZIP Codes in Monrovia
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 Monrovia
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 Monrovia
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Monrovia: Remediation Cost in Perspective
Given current Monrovia valuations, the remediation-to-property-value ratio is low — most homeowners are looking at a proportionally modest share that fits within routine financial planning.
Remediation costs in Monrovia are relatively low compared to home values. The $600–$2,100 estimated range is a small fraction of median property value. Home values are 18% above the California average.
Climate-Related Water Risk for Monrovia
Across the NFIP's long tracking period, Monrovia shows 12 claims and 50% 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.
Monrovia has a moderate flood history with 12 FEMA claims averaging $1,451 per payout. 50% 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>$1,300</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.
What You Can Do in Monrovia
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Lead can reduce the most common contaminant found in Monrovia's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Monrovia, CA