Water Quality in Rosamond, CA: 30 Violations — Grade F
Grade F · Score 28/100 · 5 water systems · Updated 2026-05-03
Rosamond's water has serious compliance issues. Independent testing and filtration are strongly recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Compliance records maintained by the EPA for Rosamond, CA log 30 violations — accumulated reportable events drawn from every local utility in the SDWIS national tracking system.
Water Quality by ZIP Code in Rosamond
Water quality varies across Rosamond's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93560 | F | 28 | 30 | 29 | View report → |
Violation Trend
EPA violations recorded for water systems serving Rosamond.
Water Quality Overview
Rosamond, California receives a water quality grade of F with an overall score of 28 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Rosamond have accumulated 30 EPA violations, including 29 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 18,134 people.
What Grade F Means
A grade of F indicates serious compliance issues. Rosamond's water systems have substantial violations. Residents should strongly consider independent water testing and appropriate filtration.
Lead Levels
The average 90th percentile lead level across Rosamond water systems is 0.0660 mg/L — this exceeds the EPA action level of 0.015 mg/L. 1 ZIP code exceed the EPA lead action level.
Radon Risk
Rosamond is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Rosamond
Rosamond is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 18,134 people across 1 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 2 enforcement actions against water systems serving Rosamond. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Rosamond
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
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 Rosamond Water Systems
The following contaminants have been detected or caused violations across Rosamond's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Barium | Inorganic | 2 mg/L | 17 | 1 | Yes |
| Combined Radium | Radionuclides | 5 pCi/L | 11 | 1 | Yes |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Rosamond:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 7 | 7 |
| 2025 | 8 | 8 |
Violations have increased from 7 in 2024 to 8 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Rosamond. Recent actions:
| Date | Action Type |
|---|---|
| 2021-10-27 | State Filed Suit |
| 2021-10-22 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2021-10-27.
Rosamond vs. Nearby California Cities
How Rosamond's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Rosamond | F | 30 | 5 | 18,134 |
| Oak View | B | 3 | 4 | 17,937 |
| Coalinga | B | 3 | 5 | 18,342 |
| Belvedere Tiburon | C | 0 | 1 | 18,447 |
Common Questions About Rosamond Water
These are the most common questions residents search for about water quality in Rosamond, California:
Is Rosamond water hard or soft? Water hardness varies by source. Rosamond's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Rosamond tap water? Rosamond's water receives a grade of F (28/100). There are 29 health-based violations — consider filtration.
What is the best water filter for Rosamond? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Rosamond vs. California Average
Understanding how Rosamond 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 Rosamond.
ZIP Codes in Rosamond
Rosamond spans 1 ZIP code. The ZIP with the lowest water quality score is 93560. Each ZIP code has its own water quality profile based on the specific water system serving that area. 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
Updated daily.