Tap Water Quality Report
Tap water quality in Chula Vista, California
Tap water in Chula Vista, California receives a grade of D (68/100) from TapWaterSafety.org. It's served by SWEETWATER AUTHORITY. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Chula Vista's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Chula Vista.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 30.0 ppb, 500x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 39.3 ppb, 262x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.524 ppb.
EPA compliance record
Official U.S. EPA records for SWEETWATER AUTHORITY (system ID CA3710025) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Chula Vista
Filters matched to the specific contaminants in Chula Vista's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Chula Vista's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
30.0 ppb | 0.06 | — | — | — | — | — | 500× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
39.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 262× over |
| Dibromoacetic acid Disinfection byproduct |
7.42 ppb | 0.03 | — | — | — | — | — | 247× over |
| Bromodichloromethane Disinfection byproduct |
11.7 ppb | 0.06 | — | — | — | — | — | 195× over |
| Dibromochloromethane Disinfection byproduct |
13.7 ppb | 0.1 | — | — | — | — | — | 137× over |
| Arsenic Heavy metal |
0.524 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 131× over |
| Dichloroacetic acid Disinfection byproduct |
8.73 ppb | 0.2 | — | — | — | — | — | 44× over |
| Trichloroacetic acid Disinfection byproduct |
1.96 ppb | 0.1 | — | — | — | — | — | 20× over |
| Chloroform Disinfection byproduct |
7.05 ppb | 0.4 | — | — | — | — | — | 18× over |
| Bromoform Disinfection byproduct |
6.85 ppb | 0.5 | — | — | — | — | — | 14× over |
| Uranium Radiological |
1.13 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 2.6× over |
| Chromium (hexavalent) Heavy metal |
0.0343 ppb | 0.02 | — | — | — | — | — | 1.7× over |
| Chlorate Disinfection byproduct |
275.1 ppb | 210.0 | — | — | — | — | — | 1.3× over |
| Nitrate and nitrite Inorganic |
0.0576 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate Inorganic |
0.0502 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Manganese Heavy metal |
21.7 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
4.08 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0112 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
4.32 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
33.1 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Aluminum Heavy metal |
21.1 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Selenium Heavy metal |
0.337 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.087 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.684 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromide Other |
208.9 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.507 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from SWEETWATER AUTHORITY.