Water Quality in Rancho Cucamonga, CA: 15 Violations — Grade B
Grade B · Score 80/100 · 3 water systems · Updated 2026-05-03
Rancho Cucamonga'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
Water systems in Rancho Cucamonga, CA have accumulated 15 EPA violations across the full compliance record — a dataset that captures reportable health-based exceedances, monitoring lapses, and enforcement actions filed with the federal Safe Drinking Water Information System.
Water Quality Map: Rancho Cucamonga, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Rancho Cucamonga
Water quality varies across Rancho Cucamonga's 5 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 91701 | B | 77 | 3 | 0 | View report → |
| 91730 | B | 77 | 3 | 0 | View report → |
| 91729 | B | 82 | 3 | 0 | View report → |
| 91737 | B | 82 | 3 | 0 | View report → |
| 91739 | B | 82 | 3 | 0 | View report → |
Water Quality Overview
Rancho Cucamonga, California receives a water quality grade of B with an overall score of 80 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Rancho Cucamonga have accumulated 15 EPA violations (all monitoring/reporting type). These violations are tracked across 5 ZIP codes serving approximately 211,546 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Rancho Cucamonga'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 Rancho Cucamonga water systems is 0.0020 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 46% of homes built before 1986, Rancho Cucamonga 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
Rancho Cucamonga is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Rancho Cucamonga
Rancho Cucamonga is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 211,546 people across 5 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 35 enforcement actions against water systems serving Rancho Cucamonga. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Rancho Cucamonga
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 Rancho Cucamonga Water Systems
The following contaminants have been detected or caused violations across Rancho Cucamonga's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | N/A | 5 | 5 | No |
| Lead | Inorganic | 0.015 mg/L | 5 | 5 | 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 7 enforcement actions against water systems serving Rancho Cucamonga. Recent actions:
| Date | Action Type |
|---|---|
| 2025-03-03 | State Order Extension |
| 2025-02-06 | State Filed Suit |
| 2024-07-01 | State Order Extension |
| 2024-06-25 | State Filed Suit |
| 2023-10-11 | State Filed Suit |
| 2022-09-16 | State Order Extension |
| 2022-01-14 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-03-03.
Rancho Cucamonga vs. Nearby California Cities
How Rancho Cucamonga's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Rancho Cucamonga | B | 15 | 3 | 211,546 |
| Oxnard | C | 21 | 5 | 209,147 |
| Stockton | C | 180 | 5 | 208,486 |
| San Gabriel | C | 0 | 2 | 208,233 |
Recommended Water Filters for Rancho Cucamonga
Based on contaminants detected in Rancho Cucamonga's water supply, these filter types are recommended:
Reverse Osmosis (under-sink)
- Removes: Nitrate as N (NO3-N), Total Alpha
- Effectiveness: 85-95%
- Cost range: $150–$500
- Certification: NSF/ANSI 58
- Recommended products:
- Waterdrop G3P800
- iSpring RCC7AK
- APEC ROES-50
Granular Activated Carbon (GAC, under-sink or whole-house)
- Removes: Haloacetic Acids (HAA5)
- Effectiveness: 60-80%
- Cost range: $100–$600
- Certification: NSF/ANSI 53
- Recommended products:
Granular Activated Carbon (GAC, whole-house POE)
- Removes: Total Trihalomethanes (TTHM)
- Effectiveness: 80-99%
- Cost range: $400–$2000
- Certification: NSF/ANSI 53
- Recommended products:
Water Quality by ZIP Code in Rancho Cucamonga
Water quality varies across Rancho Cucamonga's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 91701 | 77 | B | 3 | 0 |
| 91730 | 77 | B | 3 | 0 |
| 91729 | 82 | B | 3 | 0 |
| 91737 | 82 | B | 3 | 0 |
| 91739 | 82 | B | 3 | 0 |
Common Questions About Rancho Cucamonga Water
These are the most common questions residents search for about water quality in Rancho Cucamonga, California:
Is Rancho Cucamonga water hard or soft? Water hardness varies by source. Rancho Cucamonga's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Rancho Cucamonga tap water? Rancho Cucamonga's water receives a grade of B (80/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Rancho Cucamonga? Based on detected contaminants, a reverse osmosis (under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
Rancho Cucamonga vs. California Average
Understanding how Rancho Cucamonga 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 Rancho Cucamonga.
ZIP Codes in Rancho Cucamonga
Rancho Cucamonga spans 5 ZIP codes. The ZIP with the lowest water quality score is 91701. 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.