Santa Rosa, CA: a top-two-band grade.

Data: EPA SDWIS

Water Quality Map: Santa Rosa, CA

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Overview

We track home safety data for 8 ZIP codes in Santa Rosa, California, covering 17 community water systems serving approximately 210,635 people. The EPA snapshots used for this build directly map water systems to 6 of 8 ZIP codes.

5 of 6 ZIP codes with a reported violation count in the available EPA record (83%) have recorded EPA violations. 3 health-based violations appear in the available health breakdown.

Home Safety Score

Average Home Safety Score for Santa Rosa: A (96/100)

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

Santa Rosa water systems draw from: Groundwater.

Lead & Copper

• Average of reported 90th-percentile lead results: 0.0035 mg/L (EPA action level: 0.015 mg/L)
• 0 of 6 ZIP codes with known status exceed the EPA lead action level

Radon Risk

8 of 8 ZIP records with known zones are in EPA Radon Zone 3.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Areas with Most Violations

Areas with No Violations

All ZIP Codes in Santa Rosa

• 95401 [A]
• 95402
• 95403 [A] - 1 violation
• 95404 [A] - 11 violations ⚠
• 95405 [A] - 3 violations ⚠
• 95406
• 95407 [A] - 2 violations
• 95409 [A] - 3 violations ⚠

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.

Housing Age Profile

Median construction year in Santa Rosa: 1977, set against the 1986 federal lead limits for new plumbing.

1977

Median Year Built

64%

Pre-1986 (lead solder era; lead paint banned 1978)

32%

Pre-1970 (Lead Pipes Risk)

Pre-1970 (32%) 1970–1986 (32%) Post-1986 (36%)

Over half of homes in Santa Rosa were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.

Source: U.S. Census Bureau ACS B25034.

Cost Context: What Remediation Means for Santa Rosa Homeowners

How large is the remediation estimate next to home prices in Santa Rosa? Small in relative terms: it amounts to 1% of the median value or less, although the dollar figure below is still an estimate and actual costs vary by property and contractor.

Median Home Value

$749,700

Est. Remediation

$400

Remediation as % of home value 0.1%

Estimated remediation costs in Santa Rosa can be compared with local home values. The $200–$900 estimated range can be set against the median property value; actual costs vary by home. Home values are 2% above the California average.

Lead Exposure Risk for Children in Santa Rosa

64%

Homes Built Before 1986

0.0035

mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical NFIP Claim Context in Santa Rosa

128

Total FEMA Flood Claims

$18,963

Avg Reported Sum With Payment Data

57%

A/V Share of Claim-Record ZIPs

Historical NFIP data for Santa Rosa contains 128 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $18,963. Among ZIP codes with claim records, 57% 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 $400 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.