Water Quality in Rosemead, CA: 9 Violations - Grade N/A
5 water systems · 1 directly mapped ZIP records
Available EPA records report 9 violations across 1 directly mapped ZIP records with known counts for Rosemead. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Rosemead
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 91770 | 9 | 0 | View report → |
Water Quality Overview
Rosemead, California has directly mapped EPA water-system data for 1 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 9 violations (all classified as monitoring/reporting type in the available record) across 1 directly mapped ZIP record with reported counts.
Lead Levels
The average 90th percentile lead level across Rosemead water systems is 0.0000 mg/L - within EPA limits. No exceedances appear among the 1 ZIP records with known lead status.
With 82% of homes built before 1986, Rosemead has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Rosemead
Rosemead is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 58,893 people across 3 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 8 enforcement actions against water systems serving Rosemead. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Rosemead
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Rosemead Water Systems
The following contaminants have been detected or caused violations across Rosemead's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Chlorodibromoacetic Acid | Disinfection Byproducts | 0.06 mg/L | 4 | 1 | No |
| HAA6Br | Disinfection Byproducts | 0.06 mg/L | 4 | 1 | No |
| Lead | Inorganic | 0.015 mg/L | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 8 enforcement actions against water systems serving Rosemead. Recent actions:
| Date | Action Type |
|---|---|
| 2026-02-17 | State Filed Judgment |
| 2024-10-08 | State Order Extension |
| 2023-12-27 | State Filed Suit |
| 2023-11-15 | State Order Extension |
| 2023-10-16 | State Filed Suit |
| 2023-09-11 | State Filed Suit |
| 2023-05-01 | State Order Extension |
| 2023-01-12 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-02-17.
Rosemead vs. Nearby California Cities
How Rosemead's water quality compares to similar cities in California:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Rosemead | 1 | 9 | 5 | 58,893 |
| Hollister | 1 | 8 | 5 | 58,374 |
| Lompoc | 2 | 1 | 5 | 59,522 |
| Monterey Park | 2 | 2 | 5 | 59,589 |
Common Questions About Rosemead Water
These are the most common questions residents search for about water quality in Rosemead, California:
Is Rosemead water hard or soft? Water hardness varies by source. Rosemead's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Rosemead tap water? City-level EPA records cannot determine safety at a specific tap. No health-based violations are recorded across 1 directly mapped ZIP records with known counts, but this is not a property-level safety guarantee.
What is the best water filter for Rosemead? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Rosemead vs. California Average
Understanding how Rosemead compares to the broader California average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Rosemead.
ZIP Codes in Rosemead
Rosemead spans 3 ZIP codes. EPA water-system coverage is available for 1 directly mapped ZIP code. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.