Water Quality in Coalinga, CA: 3 Violations — Grade B
Grade B · Score 72/100 · 5 water systems · Updated 2026-05-03
Coalinga's water is mostly safe. Minor violations exist but are primarily monitoring-related.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Federal EPA data for Coalinga, CA shows 3 water compliance events in the record — the table below identifies system names and violation types.
Water Quality by ZIP Code in Coalinga
Water quality varies across Coalinga's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93210 | B | 72 | 3 | 3 | View report → |
Water Quality Overview
Coalinga, California receives a water quality grade of B with an overall score of 72 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Coalinga have accumulated 3 EPA violations, including 3 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 18,342 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Coalinga's water systems meet the vast majority of federal requirements. Minor violations may exist but typically relate to monitoring or reporting rather than health-based standards.
Lead Levels
The average 90th percentile lead level across Coalinga water systems is 0.0011 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 55% of homes built before 1986, Coalinga 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.
Radon Risk
Coalinga is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Coalinga
Coalinga is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 18,342 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 3 enforcement actions against water systems serving Coalinga. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Coalinga
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 Coalinga Water Systems
The following contaminants have been detected or caused violations across Coalinga's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 2 | 1 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 1 | 1 | Yes |
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 3 enforcement actions against water systems serving Coalinga. Recent actions:
| Date | Action Type |
|---|---|
| 2024-12-16 | State Filed Suit |
| 2021-10-04 | State Order Extension |
| 2021-04-23 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-12-16.
Coalinga vs. Nearby California Cities
How Coalinga's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Coalinga | B | 3 | 5 | 18,342 |
| Belvedere Tiburon | C | 0 | 1 | 18,447 |
| Sausalito | A | 0 | 1 | 18,447 |
| Rosamond | F | 30 | 5 | 18,134 |
Common Questions About Coalinga Water
These are the most common questions residents search for about water quality in Coalinga, California:
Is Coalinga water hard or soft? Water hardness varies by source. Coalinga's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Coalinga tap water? Coalinga's water receives a grade of B (72/100). There are 3 health-based violations — consider filtration.
What is the best water filter for Coalinga? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Coalinga vs. California Average
Understanding how Coalinga 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 Coalinga.
ZIP Codes in Coalinga
Coalinga spans 1 ZIP code. The ZIP with the lowest water quality score is 93210. 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade B is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.