A100/100
Rowland Heights Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 54,660 residents · California
What's In Rowland Heights's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
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
ROWLAND WATER DISTRICT
Population Served
54,660
Water Source
Purchased Surface Water
System ID
CA1910194
Frequently Asked Questions About Rowland Heights Water
Is Rowland Heights tap water safe to drink?
Rowland Heights, California tap water receives a grade of A (100/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Rowland Heights's water?
69 contaminants were tested in Rowland Heights's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Rowland Heights have any water quality violations?
No, Rowland Heights has zero EPA violations on record. This means the water utility has consistently met all federal drinking water standards during the compliance periods tracked by the EPA.
Do I need a water filter in Rowland Heights?
Rowland Heights 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 Rowland Heights's tap water come from?
Rowland Heights's drinking water is sourced from purchased surface water and supplied by ROWLAND WATER DISTRICT. The system serves approximately 54,660 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Rowland Heights'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. Rowland Heights'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 Rowland Heights's water compare to other cities in California?
Rowland Heights's water quality score of 100/100 earns a grade of A, which is considered excellent. This places Rowland Heights 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 Rowland Heights's water quality?
If you have concerns about Rowland Heights'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 (ROWLAND WATER DISTRICT) 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.