A84/100
Arcata Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 20,875 residents · California
What's In Arcata's Tap Water?
67
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.50 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 1993.
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
ARCATA, CITY OF
Population Served
20,875
Water Source
Purchased Groundwater
System ID
CA1210001
Frequently Asked Questions About Arcata Water
Is Arcata tap water safe to drink?
Arcata, California tap water receives a grade of A (84/100), which is considered excellent. Out of 67 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Arcata's water?
Of the 67 contaminants tested in Arcata'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 Arcata have any water quality violations?
Yes, Arcata has 1 EPA violation(s) on record, with the most recent in 1993. Violation types include TT. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Arcata?
Based on EPA data, using a water filter in Arcata 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 Arcata's tap water come from?
Arcata's drinking water is sourced from purchased groundwater and supplied by ARCATA, CITY OF. The system serves approximately 20,875 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Arcata'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. Arcata'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 Arcata's water compare to other cities in California?
Arcata's water quality score of 84/100 earns a grade of A, which is considered excellent. This places Arcata among the better-performing water systems in California. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Arcata's water quality?
If you have concerns about Arcata'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 (ARCATA, CITY OF) 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.