CITY OF SUNNYVALE
PWS ID: CA4310014 · SUNNYVALE, California 94088
Population Served
157,566
Total Violations
145
Health-Based Violations
10
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 28,372
- County
- Santa Clara
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 131
- Treatment Tech Violations
- 10
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 10 | 2015 |
| Lead and Copper Rule | MR | 3 | 1992 |
| Arsenic | MR | 2 | 2015 |
| Fluoride | MR | 2 | 2015 |
| Mercury | MR | 2 | 2015 |
| Nitrite | MR | 2 | 2015 |
| Thallium, Total | MR | 2 | 2015 |
| cis-1,2-Dichloroethylene | MR | 2 | 2015 |
| DICHLOROMETHANE | MR | 2 | 2015 |
| o-Dichlorobenzene | MR | 2 | 2015 |
| trans-1,2-Dichloroethylene | MR | 2 | 2015 |
| 1,1,1-Trichloroethane | MR | 2 | 2015 |
| Trichloroethylene | MR | 2 | 2015 |
| Benzene | MR | 2 | 2015 |
| Endrin | MR | 2 | 2015 |
| Methoxychlor | MR | 2 | 2015 |
| Endothall | MR | 2 | 2015 |
| Glyphosate | MR | 2 | 2015 |
| Di(2-ethylhexyl) adipate | MR | 2 | 2015 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2015 |
| Picloram | MR | 2 | 2015 |
| Dinoseb | MR | 2 | 2015 |
| Hexachlorocyclopentadiene | MR | 2 | 2015 |
| Carbofuran | MR | 2 | 2015 |
| LASSO | MR | 2 | 2015 |
| 2,3,7,8-TCDD | MR | 2 | 2015 |
| Heptachlor | MR | 2 | 2015 |
| 2,4-D | MR | 2 | 2015 |
| HEXACHLOROBENZENE | MR | 2 | 2015 |
| Pentachlorophenol | MR | 2 | 2015 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 600 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 7/29/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFUnA | 7/29/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTA | 7/29/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOA | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 6:2 FTS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 7/29/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/29/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFPeA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/29/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| lithium | 7/17/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFHpA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 7/17/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/17/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 8:2 FTS | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 7/17/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
PFAS data from EPA UCMR5 monitoring program (2023-2025).
This data is provided for informational purposes only.