Chula Vista, CA Water Safety: 97/100 (2026)
8 ZIP codes · 4 water systems · Updated 2026-06-03
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.
How Chula Vista Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Chula Vista, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Chula Vista.
Chula Vista Water: The Quick Version
- Average lead level: 0.0038 mg/L.
- Homes built before 1986: 35% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 10.18.
Water Systems Serving Chula Vista
4 water systems are tracked federally in Chula Vista, CA. The top 3 providers collectively serve most residential addresses, but because they operate independently, infrastructure maintenance standards and compliance histories differ from one service zone to another.
Overview
We track water quality and home safety data for 8 ZIP codes in Chula Vista, California (population ~272,064), covering 4 community water systems serving approximately 535,290 people region-wide.
No EPA violations recorded across any ZIP codes in Chula Vista — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Chula Vista: A (97/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Chula Vista water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0038 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes 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
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91909 | A | Sweetwater Authority | 191,282 |
| 91910 | A | Sweetwater Authority | 191,282 |
| 91911 | A | Sweetwater Authority | 191,282 |
| 91912 | A | Sweetwater Authority | 191,282 |
| 91913 | A | Sweetwater Authority | 191,282 |
| 91914 | A | Sweetwater Authority | 191,282 |
| 91915 | A | OTAY WATER DISTRICT | 238,008 |
| 91921 | A | Sweetwater Authority | 191,282 |
All ZIP Codes in Chula Vista
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
Updated daily.
CDC Health Data for Chula Vista
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
How Old Is Chula Vista's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
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.
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.
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
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.
Climate-Related Water Risk for Chula Vista
Flood activity in Chula Vista is neither negligible nor at the level of the highest-exposure areas in the NFIP dataset. The 25-claim record and 38% flood zone coverage suggest a community that has experienced recurrent events but has not faced the kind of sustained, severe exposure where water-supply contamination becomes a primary public health concern. It sits in a middle range where flood history merits inclusion in any complete local water quality picture.
Chula Vista has a moderate flood history with 25 FEMA claims averaging $5,687 per payout. 38% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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. Flood damage can add significantly to the estimated <strong>$1,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Chula Vista, CA