Granite Bay, CA Home Safety: Home Safety 75/100
1 ZIP code · 5 water systems · Updated
ZipCheckup grade for Granite Bay: B.
This ZIP looks solid, with a few items worth a quick check.
Water systems serving Granite Bay hold a strong EPA compliance record - the city places among the better-performing areas in CA with few health-based violations on file.
How Granite Bay Compares
Data: EPA SDWIS
What You Should Know About Granite Bay Water
- Average lead level: 0.0008 mg/L.
- Homes built before 1986: 44% - older plumbing may contain lead solder.
- Estimated remediation: $2,200 per household.
- CDC health risk index: 11.13.
Who Supplies Your Water in Granite Bay
Residential water service in Granite Bay, CA is divided among 3 separate utilities, drawn from 5 systems on file with federal regulators.
- B
- B
- B
Overview
We track home safety data for 1 ZIP code in Granite Bay, California (population ~22,549), covering 5 community water systems serving approximately 275,752 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
The available EPA record reports 0 violations for 1 ZIP code with a reported violation count.
Home Safety Score
Average Home Safety Score for Granite Bay: B (75/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Granite Bay water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0008 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 95746 | B | San Juan Water District | 29,598 |
All ZIP Codes in Granite Bay
- 95746 [B]
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
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Granite Bay
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Housing & Infrastructure in Granite Bay
With 44% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
For a city with a median build year of 1981, Granite Bay carries a housing profile that straddles the 1986 federal ban on lead solder in plumbing. Neither predominantly new nor predominantly old, the stock presents a moderate aggregate risk environment - with individual risk varying sharply depending on when and where a specific home was built.
Most homes in Granite Bay were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Granite Bay Homeowners
Low proportionality - that's the Granite Bay picture when remediation costs are placed against typical home equity.
Remediation costs in Granite Bay are relatively low compared to home values. The $1,200–$3,300 estimated range is a small fraction of median property value. Home values are 43% above the California average.
Lead Exposure Risk for Children in Granite Bay
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Households with kids in the home - for whom CDC guidance places particular weight on minimizing exposure - face a specific local picture in Granite Bay. 44% of homes here come from the pre-rule era, and aggregate utility samples either approach or cross 0.015 mg/L. A baseline draw-test kit and certified lead-removal filtration are available via retailer networks for households confirming conditions at a specific tap.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Granite Bay
Historical NFIP data for Granite Bay contains 118 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $36,170. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The <strong>$2,200</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for Granite Bay, CA