F4/100
Portola Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 3,414 residents · California
What's In Portola's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.50 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2013.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
GRIZZLY LAKE CSD-DELLEKER
Population Served
1,314
Water Source
Groundwater
System ID
CA3200104
CITY OF PORTOLA
Population Served
2,100
Water Source
Purchased Surface Water
System ID
CA3210003
Frequently Asked Questions About Portola Water
Is Portola tap water safe to drink?
Portola, California tap water receives a grade of F (4/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 68 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Portola's water?
Of the 2 contaminants tested in Portola's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Portola have any water quality violations?
Yes, Portola has 68 EPA violation(s) on record, with the most recent in 2024. Violation types include MON, MCL, MR. 59 of these are health-based violations, which are the most serious category.
Do I need a water filter in Portola?
Based on EPA data, using a water filter in Portola is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Portola's tap water come from?
Portola's drinking water is sourced from groundwater and supplied by GRIZZLY LAKE CSD-DELLEKER and 1 other water system(s). The system serves approximately 3,414 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Portola's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Portola's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Portola's water compare to other cities in California?
Portola's water quality score of 4/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Portola's water quality?
If you have concerns about Portola's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (GRIZZLY LAKE CSD-DELLEKER) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.