F0/100
El Cajon Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 12,350 residents · California
What's In El Cajon's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.53 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2019.
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
Sycuan
Population Served
12,350
Water Source
Purchased Surface Water
System ID
090605024
Frequently Asked Questions About El Cajon Water
Is El Cajon tap water safe to drink?
El Cajon, California tap water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 47 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in El Cajon's water?
Of the 32 contaminants tested in El Cajon'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 El Cajon have any water quality violations?
Yes, El Cajon has 47 EPA violation(s) on record, with the most recent in 2019. Violation types include MR, MCL, Other. 24 of these are health-based violations, which are the most serious category.
Do I need a water filter in El Cajon?
Based on EPA data, using a water filter in El Cajon 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 El Cajon's tap water come from?
El Cajon's drinking water is sourced from purchased surface water and supplied by Sycuan. The system serves approximately 12,350 people. Surface water sources include rivers, lakes, and reservoirs.
How often is El Cajon'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. El Cajon'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 El Cajon's water compare to other cities in California?
El Cajon's water quality score of 0/100 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 El Cajon's water quality?
If you have concerns about El Cajon'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 (Sycuan) 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.