Water Quality in Pismo Beach, CA: 8 Violations — Grade B
Grade B · Score 74/100 · 2 water systems · Updated 2026-05-03
Pismo Beach'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
The compliance history for Pismo Beach, CA includes 8 water violations on file with the EPA — a federal tally that spans health-based exceedances, monitoring failures, and enforcement actions logged under the Safe Drinking Water Act.
Water Quality by ZIP Code in Pismo Beach
Water quality varies across Pismo Beach's 2 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93449 | B | 72 | 4 | 3 | View report → |
| 93448 | B | 76 | 4 | 3 | View report → |
Violation Trend
EPA violations recorded for water systems serving Pismo Beach.
Water Quality Overview
Pismo Beach, California receives a water quality grade of B with an overall score of 74 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 2 water systems serving Pismo Beach have accumulated 8 EPA violations, including 6 health-based violations. These violations are tracked across 2 ZIP codes serving approximately 8,636 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Pismo Beach'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 Pismo Beach water systems is 0.0008 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 53% of homes built before 1986, Pismo Beach 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
Pismo Beach is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Pismo Beach
Pismo Beach is served by 2 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 8,636 people across 2 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 12 enforcement actions against water systems serving Pismo Beach. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Pismo Beach
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 Pismo Beach Water Systems
The following contaminants have been detected or caused violations across Pismo Beach's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 6 | 2 | Yes |
| Lead | Inorganic | 0.015 mg/L | 2 | 2 | No |
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 Pismo Beach:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2023 | 4 | 4 |
| 2024 | 2 | 2 |
Violations have decreased from 4 in 2023 to 2 in 2024, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 6 enforcement actions against water systems serving Pismo Beach. Recent actions:
| Date | Action Type |
|---|---|
| 2024-06-04 | State Order Extension |
| 2024-04-29 | State Order Extension |
| 2024-04-25 | State Filed Suit |
| 2024-04-15 | State Filed Suit |
| 2024-02-14 | State Filed Suit |
| 2023-10-11 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-06-04.
Pismo Beach vs. Nearby California Cities
How Pismo Beach's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Pismo Beach | B | 8 | 2 | 8,636 |
| Firebaugh | B | 6 | 4 | 8,616 |
| Templeton | B | 0 | 3 | 8,556 |
| Corning | B | 5 | 4 | 8,541 |
Common Questions About Pismo Beach Water
These are the most common questions residents search for about water quality in Pismo Beach, California:
Is Pismo Beach water hard or soft? Water hardness varies by source. Pismo Beach's 2 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Pismo Beach tap water? Pismo Beach's water receives a grade of B (74/100). There are 6 health-based violations — consider filtration.
What is the best water filter for Pismo Beach? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Pismo Beach vs. California Average
Understanding how Pismo Beach 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 Pismo Beach.
ZIP Codes in Pismo Beach
Pismo Beach spans 2 ZIP codes. The ZIP with the lowest water quality score is 93448. 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.