A88/100
Rosemead Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 224,479 residents · California
What's In Rosemead's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2022 – October 31, 2022Rule: Total Coliform RuleEnforcement: 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
AMARILLO MUTUAL WATER COMPANY
Population Served
3,134
Water Source
Groundwater
System ID
CA1910002
BELLFLOWER MUNICIPAL WATER SYSTEM
Population Served
5,999
Water Source
Purchased Surface Water
System ID
CA1910018
CAL-AM WATER COMPANY - EAST PASADENA
Population Served
9,949
Water Source
Groundwater
System ID
CA1910020
CAL/AM WATER COMPANY - BALDWIN HILLS
Population Served
20,724
Water Source
Purchased Surface Water
System ID
CA1910052
CAL/AM WATER COMPANY - SAN MARINO
Population Served
47,995
Water Source
Purchased Surface Water
System ID
CA1910139
SAN GABRIEL COUNTY WD
Population Served
39,345
Water Source
Groundwater
System ID
CA1910144
CAL-AM WATER COMPANY - DUARTE
Population Served
24,773
Water Source
Groundwater
System ID
CA1910186
CAL AMERICAN WC - RIO PLAZA
Population Served
1,709
Water Source
Groundwater
System ID
CA5610010
CAL AMERICAN WATER COMPANY - PIRU
Population Served
2,003
Water Source
Groundwater
System ID
CA5610021
CAL AMERICAN WATER CO
Population Served
66,809
Water Source
Purchased Surface Water
System ID
CA5610040
CAL AMERICAN WC - LAS POSAS ESTATES
Population Served
2,039
Water Source
Purchased Surface Water
System ID
CA5610081
Frequently Asked Questions About Rosemead Water
Is Rosemead tap water safe to drink?
Rosemead, California tap water receives a grade of A (88/100), which is considered excellent. Out of 77 contaminants tested, 3 exceed EPA maximum contaminant levels (MCLs) and 7 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 Rosemead's water?
Of the 77 contaminants tested in Rosemead's water supply, the most notable include PFOS, PFOA, Copper (90th percentile), Lead (90th percentile), chlorate. 3 contaminant(s) exceed EPA legal limits (MCLs). 7 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Rosemead have any water quality violations?
Yes, Rosemead has 40 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MON, MCL. 13 of these are health-based violations, which are the most serious category.
Do I need a water filter in Rosemead?
Based on EPA data, using a water filter in Rosemead is recommended. 3 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 Rosemead's tap water come from?
Rosemead's drinking water is sourced from groundwater and supplied by AMARILLO MUTUAL WATER COMPANY and 10 other water system(s). The system serves approximately 224,479 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Rosemead'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. Rosemead'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 Rosemead's water compare to other cities in California?
Rosemead's water quality score of 88/100 earns a grade of A, which is considered excellent. This places Rosemead 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 Rosemead's water quality?
If you have concerns about Rosemead'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 (AMARILLO MUTUAL WATER COMPANY) 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.