ZipCheckup grade for 91763: C.
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Montclair, CA (91763): PFAS Detected in Mapped Water Systems - 58/100
EPA data combined for 2 water systems mapped to this ZIP (largest mapped system: Monte Vista Water District)
EPA records for the water systems mapped to 91763 in Montclair, CA contain zero recorded violations for inclusive record years 2021 through 2026. This does not establish that every category was monitored or published, and it does not cover events outside that source window.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water No drinking-water violations in EPA records since 2021.
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
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Safety records for Montclair (91763) contain exactly one critical finding.
Score Breakdown
Overall Home Safety Score: 58/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) HIGH
Your Water System
ZIP code 91763 in Montclair, California is mapped to the water system Monte Vista Water District (EPA ID: CA3610029). This system provides water to approximately 56,017 people from surface water sources.
There are 2 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Monte Vista Water District | CA3610029 | 56,017 | Surface water |
| Ontario Municipal Utilities Company | CA3610034 | 185,010 | Surface water |
Other Water Quality Reports in California
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- 90018 (Los Angeles)
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- 90020 (Los Angeles)
Nearby Water Quality Reports
- 91762 (Ontario) - 2 mi - 1 violation recorded for mapped water systems
- 91767 (Pomona) - 2 mi
- 91711 (Claremont) - 3 mi
- 91758 (Ontario) - 3 mi
- 91769 (Pomona) - 3 mi
- 91785 (Upland) - 4 mi
- 91786 (Upland) - 4 mi
- 91766 (Pomona) - 4 mi
- 91764 (Ontario) - 4 mi
- 91710 (Chino) - 4 mi - 5 violations recorded for mapped water systems
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Monte Vista Water District (CA3610029) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 91763. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFOA, PFBA, PFHxS, PFHxA, PFPeA, PFOS.
Highest measured level: 0.03 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (10) CRITICAL
Home & Infrastructure (6) MODERATE
Possible home maintenance concerns - talk to a local expert.
Call (855) 384-4856Paid Partner This is a free service. You will be connected with an independent service provider. We may receive compensation.
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Montclair
Based on local data for ZIP 91763, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Gutter Installation & Repair
The median home in 91763 was built around 1961. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsWindow Replacement
The median build year of homes in Montclair is 1961; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.
Typical cost: Window replacement: typically $300–$800 per window installed
Estimate Your Home Maintenance CostsRoofing Inspection & Repair
Homes built around 1961 may be on their second or third roof. A professional inspection can catch damage before leaks start.
Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500
Estimate Your Home Insurance NeedsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 91763 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 91763 (primary system: Monte Vista Water District), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 91763's water come from?
The recorded water source for Monte Vista Water District, a system mapped to ZIP code 91763, is Surface water. This system serves approximately 56,017 people.
How does Montclair water compare to the national average?
Montclair's Home Safety Score ranks lower than 85% of U.S. ZIP codes, and lower than 95% of ZIP codes within California.
How can I get my water tested in Montclair?
If Monte Vista Water District supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
What is the radon risk for 91763?
91763 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in San Bernardino County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 91763's water?
Yes, PFAS have been detected in samples from water systems mapped to 91763. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
How to cite this page
ZipCheckup. (2026). Montclair, CA (91763): PFAS Detected in Mapped Water Systems - 58/100. https://zipcheckup.com/report/91763/
@misc{zipcheckup-report-91763,
author = {{ZipCheckup}},
title = {{Montclair, CA (91763): PFAS Detected in Mapped Water Systems - 58/100}},
year = {2026},
url = {https://zipcheckup.com/report/91763/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 91763
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 91762 | Ontario, CA | 2.1 mi | C | 1 |
| 91767 | Pomona, CA | 2.2 mi | C | 0 |
| 91711 | Claremont, CA | 2.7 mi | N/A | 0 |
| 91758 | Ontario, CA | 2.8 mi | N/A | 0 |
| 91769 | Pomona, CA | 3.3 mi | N/A | 0 |
| 91785 | Upland, CA | 3.7 mi | N/A | 0 |
| 91786 | Upland, CA | 3.7 mi | B | 0 |
| 91766 | Pomona, CA | 4.0 mi | C | 0 |
| 91764 | Ontario, CA | 4.2 mi | C | 0 |
| 91710 | Chino, CA | 4.3 mi | D | 5 |
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