San Luis Obispo
Is San Luis Obispo tap water safe to drink?
Mostly yes — San Luis Obispo scores 95/100. This report aggregates EPA drinking water data across 7 local systems in San Luis Obispo. We found 25 total violations (5 unresolved).
Real-Time Environment
Live: 11:45 AM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in San Luis Obispo.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in San Luis Obispo?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Wondering if San Luis Obispo tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with San Luis Obispo tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in San Luis Obispo, water quality belongs on your due-diligence checklist alongside schools and crime data. The high safety score (95/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Residents should monitor Copper (90th percentile) levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for San Luis Obispo
Based on EPA SDWIS violation records and contaminant test results for all water systems serving San Luis Obispo.
Frequently Asked Questions
Is San Luis Obispo tap water safe to drink?
Mostly yes — San Luis Obispo scores 95/100.
How many water systems serve San Luis Obispo?
San Luis Obispo is served by 7 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in San Luis Obispo?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for San Luis Obispo.
What is the water quality score for San Luis Obispo?
The water quality score for San Luis Obispo is 95 out of 100, based on EPA contaminant data, violation history, and testing results across the 7 systems serving the city.
What are the top contaminants in San Luis Obispo?
The top contaminants detected in San Luis Obispo include Copper (90th percentile), Lead (90th percentile). View detailed information on our contaminants page.
San Luis Obispo Water Quality Summary
San Luis Obispo, CA receives a water quality score of 95/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 7 public water systems serving the area.
San Luis Obispo's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.
San Luis Obispo's score of 95 is 6 points above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.
For residents and prospective homebuyers in San Luis Obispo, the local tap water offers reassurance by consistently achieving exceptional quality marks. This mid-size California city distributes its supply through several distinct systems, maintaining outstanding water safety despite a regional footprint that features varied geology, major urban centers, and Central Valley agriculture. For families settling here, this means reliable and highly rated daily tap water directly in the home.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our California water quality rankings report →
Key Contaminants
Get notified if San Luis Obispo's water quality changes
Free email alert when the EPA reports a new violation or boil-water advisory for your water system. No spam — just the alerts you asked for.
By subscribing you agree to receive occasional water-quality alert emails. Unsubscribe anytime. See our Privacy Policy.
Water Systems Serving San Luis Obispo (7)
Slocsa #10A - Cayucos
ASlo Csa No. 16 - Shandon
ASlo Cwwd No. 23 - Santa Margarita
ALopez Project
ACalifornia Mens Colony
ASan Luis Obispo Water Department
ATiger Water Supply
BCheck Your Specific Address
Water quality can vary by neighborhood in San Luis Obispo.
Related
Quick compare in California
Compare San Luis Obispo water quality: View all states · Contaminant library · How we score water quality