Tap Water Quality Report
Tap water quality in SUNNYVALE, California
Tap water in SUNNYVALE, California receives a grade of D (64/100) from TapWaterSafety.org. It's served by CITY OF SUNNYVALE. 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. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in SUNNYVALE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving SUNNYVALE.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 32.8 ppb, 547x 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 51.7 ppb, 344x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF SUNNYVALE (system ID CA4310014) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Nitrate Rule | Missed testing or reporting | 01/01/2015 | Open |
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2015 | Open |
| Volatile Organic Chemicals | Missed testing or reporting | 01/01/2015 | Open |
| Inorganic Chemicals | Missed testing or reporting | 01/01/2015 | Open |
| Arsenic Rule | Missed testing or reporting | 01/01/2015 | Open |
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 SUNNYVALE
Filters matched to the specific contaminants in SUNNYVALE'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.
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 SUNNYVALE'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 |
32.8 ppb | 0.06 | — | — | — | — | — | 547× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
51.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 344× over |
| Bromodichloromethane Disinfection byproduct |
10.2 ppb | 0.06 | — | — | — | — | — | 171× over |
| Dibromoacetic acid Disinfection byproduct |
4.68 ppb | 0.03 | — | — | — | — | — | 156× over |
| Dibromochloromethane Disinfection byproduct |
14.0 ppb | 0.1 | — | — | — | — | — | 140× over |
| Trichloroacetic acid Disinfection byproduct |
6.35 ppb | 0.1 | — | — | — | — | — | 63× over |
| Chloroform Disinfection byproduct |
20.7 ppb | 0.4 | — | — | — | — | — | 52× over |
| Dichloroacetic acid Disinfection byproduct |
9.26 ppb | 0.2 | — | — | — | — | — | 46× over |
| Chromium (hexavalent) Heavy metal |
0.778 ppb | 0.02 | — | — | — | — | — | 39× over |
| Nitrate Inorganic |
3.44 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Nitrate and nitrite Inorganic |
3.17 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 23× over |
| Bromoform Disinfection byproduct |
6.68 ppb | 0.5 | — | — | — | — | — | 13× over |
| Chlorate Disinfection byproduct |
112.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
2.29 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
53.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
1.15 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.433 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.574 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0306 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.305 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.115 ppb | — | — | — | — | — | — | Below guideline |
| Alpha-hexachlorocyclohexane Radiological |
0.0008 ppb | — | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.203 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.155 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 CITY OF SUNNYVALE.