C58/100
Plymouth Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,060 residents · California
What's In Plymouth's Tap Water?
1
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 3Unresolved
Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2021 – December 31, 2021Rule: Stage 2 DBPREnforcement: Formal — state order issued
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
PLYMOUTH, CITY OF
Population Served
1,060
Water Source
Purchased Surface Water
System ID
CA0310004
Frequently Asked Questions About Plymouth Water
Is Plymouth tap water safe to drink?
Plymouth, California tap water receives a grade of C (58/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 26 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Plymouth's water?
1 contaminants were tested in Plymouth's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Plymouth have any water quality violations?
Yes, Plymouth has 26 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, MCL, MON. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in Plymouth?
Plymouth water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Plymouth's tap water come from?
Plymouth's drinking water is sourced from purchased surface water and supplied by PLYMOUTH, CITY OF. The system serves approximately 1,060 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Plymouth'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. Plymouth'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 Plymouth's water compare to other cities in California?
Plymouth's water quality score of 58/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Plymouth's water quality?
If you have concerns about Plymouth'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 (PLYMOUTH, 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.