Unlike many cities its size in CA, Chula Vista keeps health-based violation rates low - systems here score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.

Data: EPA SDWIS

Water Quality Map: Chula Vista, 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 Chula Vista, California (population ~272,064), covering 3 community water systems serving approximately 535,290 people region-wide. The EPA snapshots used for this build directly map water systems to 5 of 8 ZIP codes.

1 of 5 ZIP codes with a reported violation count in the available EPA record (20%) have recorded EPA violations. 1 health-based violation appear in the available health breakdown.

Home Safety Score

Average Home Safety Score for Chula Vista: A (85/100)

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

Chula Vista water systems draw from: Surface water.

Lead & Copper

• Average lead level (90th percentile): 0.0004 mg/L (EPA action level: 0.015 mg/L)
• 0 of 5 ZIP codes with known status exceed the EPA lead action level

Radon Risk

Dominant radon zone: Zone 3 (Low Risk)

• Zone 1 (High): 0 ZIP codes
• Zone 2 (Moderate): 0 ZIP codes
• Zone 3 (Low): 8 ZIP codes

Top Contaminants

Areas with Most Violations

Areas with No Violations

All ZIP Codes in Chula Vista

• 91909
• 91910 [B]
• 91911 [B] - 1 violation ⚠
• 91912
• 91913 [A]
• 91914 [A]
• 91915 [A]
• 91921

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

Over the decades, Chula Vista accumulated housing from multiple construction periods. The median build year of 1994 places the midpoint of that stock near the 1986 threshold when lead solder in plumbing became federally prohibited - leaving a sizable share of homes on each side of that safety line.

1994

Median Year Built

35%

Pre-1986 (Lead Paint Risk)

11%

Pre-1970 (Lead Pipes Risk)

Pre-1970 (11%) 1970–1986 (24%) Post-1986 (65%)

Most homes in Chula Vista 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.

Chula Vista: Remediation Cost in Perspective

When remediation costs are measured against Chula Vista home values, the resulting ratio is in the low tier - addressing documented water and safety issues here claims only a minor fraction of typical equity, and most homeowners are in a position where the financial commitment is straightforward rather than a material burden on their household budget.

Median Home Value

$719,600

Est. Remediation

$1,800

Remediation as % of home value 0.3%

Remediation costs in Chula Vista are relatively low compared to home values. The $1,200–$2,567 estimated range is a small fraction of median property value. Home values are 3% below the California average.

Protecting Children from Lead in Chula Vista

35%

Homes Built Before 1986

0.0004

mg/L Avg Lead (Limit: 0.015)

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.

35% of Chula Vista housing dates to the pre-rule era, alongside aggregate readings hovering at the federal action mark - household-level confirmation through a draw-test kit fits the local picture.

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

Historical Flood-Claim Evidence for Chula Vista

25

Total FEMA Flood Claims

$12,462

Avg Reported Sum With Payment Data

33%

A/V Share of Claim-Record ZIPs

Historical NFIP data for Chula Vista contains 25 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $12,462. Among ZIP codes with claim records, 33% 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>$1,800</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.