Arroyo Grande, CA: 4 Violations — 79/100 (2026)
2 ZIP codes · 7 water systems · Updated 2026-06-03
Tap water monitoring data for Arroyo Grande shows a consistently clean picture in CA — few violations on record, compliance well above the median.
How Arroyo Grande Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Arroyo Grande Water
- Your city's water systems recorded 4 violations in the past 5 years.
- Average lead level: 0.0022 mg/L.
- Estimated remediation: $1,300 per household.
- CDC health risk index: 11.26.
Who Supplies Your Water in Arroyo Grande
Arroyo Grande, CA is covered by 3 major water utilities out of 7 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
Overview
We track water quality and home safety data for 2 ZIP codes in Arroyo Grande, California, covering 7 community water systems serving approximately 32,016 people.
2 of 2 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Arroyo Grande: B (79/100)
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
Arroyo Grande water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0022 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): 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 |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 6 | 2 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 93420 | B | 2 | 0 | City of Arroyo Grande Utilities Division |
| 93421 | B | 2 | 0 | City of Arroyo Grande Utilities Division |
All ZIP Codes in Arroyo Grande
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 Arroyo Grande
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 Arroyo Grande Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Cost Context: What Remediation Means for Arroyo Grande Homeowners
At current valuations, Arroyo Grande sits in the low remediation-share tier — the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Arroyo Grande 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.
Lead Exposure Risk for Children in Arroyo Grande
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.
Lead risk in Arroyo Grande appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Arroyo Grande
Over the multi-decade window covered by the National Flood Insurance Program, Arroyo Grande has accumulated 40 claims — a total that suggests more than isolated flood exposure. With 50% of ZIP codes in designated flood zones, the water-quality implications of flooding move from hypothetical to periodically relevant: treatment intake can be compromised, wells can be infiltrated, and distribution backflow can occur.
Arroyo Grande has a moderate flood history with 40 FEMA claims averaging $19,564 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.
Deep Dive Reports
Detailed analysis for Arroyo Grande, CA