Water Quality in Arroyo Grande, CA: 37 Violations - Grade N/A
5 water systems · 1 directly mapped ZIP records
Available EPA records report 37 violations across 1 directly mapped ZIP records with known counts for Arroyo Grande. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Arroyo Grande
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 93420 | 37 | 13 | View report → |
Water Quality Overview
Arroyo Grande, California has directly mapped EPA water-system data for 1 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 37 violations, including 13 health-based violations across 1 directly mapped ZIP record with reported counts.
Lead Levels
The average 90th percentile lead level across Arroyo Grande water systems is 0.0170 mg/L - this exceeds the EPA action level of 0.015 mg/L. 1 ZIP code exceed the EPA lead action level.
With 56% of homes built before 1986, Arroyo Grande has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Arroyo Grande
Arroyo Grande is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 32,016 people across 2 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 3 enforcement actions against water systems serving Arroyo Grande. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Arroyo Grande
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Arroyo Grande Water Systems
The following contaminants have been detected or caused violations across Arroyo Grande's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead | Inorganic | 0.015 mg/L | 25 | 1 | Yes |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
| Stage 1 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 3 enforcement actions against water systems serving Arroyo Grande. Recent actions:
| Date | Action Type |
|---|---|
| 2025-08-01 | State Filed Suit |
| 2024-06-13 | State Filed Suit |
| 2024-06-11 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-08-01.
Arroyo Grande vs. Nearby California Cities
How Arroyo Grande's water quality compares to similar cities in California:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Arroyo Grande | 1 | 37 | 5 | 32,016 |
| Stanton | 1 | 5 | 4 | 31,949 |
| Studio City | 1 | 0 | 1 | 32,118 |
| Bloomington | 1 | 3 | 5 | 31,909 |
Common Questions About Arroyo Grande Water
These are the most common questions residents search for about water quality in Arroyo Grande, California:
Is Arroyo Grande water hard or soft? Water hardness varies by source. Arroyo Grande's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Arroyo Grande tap water? City-level EPA records cannot determine safety at a specific tap. The measured subset contains 13 health-based violations; check the affected utility record and consider certified testing.
What is the best water filter for Arroyo Grande? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Arroyo Grande vs. California Average
Understanding how Arroyo Grande compares to the broader California average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Arroyo Grande.
ZIP Codes in Arroyo Grande
Arroyo Grande spans 2 ZIP codes. EPA water-system coverage is available for 1 directly mapped ZIP code. Check each ZIP code for detailed contaminant data, violation history, and system information.
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
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.