Community Water System · PWS CA4310014
City of Sunnyvale
Operator location Sunnyvale, California - larger served population (> 3,309) at 157,566 people served; 145 SDWIS violations on record from surface water sources.
- 157,566
- People served (this PWS)
- 145
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
City of Sunnyvale standing, high SDWIS violation third
157,566 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #278 of 29,740 among systems serving 500+.
The verdict
City of Sunnyvale sits in the upper third of the sitemap cohort by violation count (145), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (157,566; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #278 of 29,740
- Population · /systems
- #50 of 1,701
- Population · CA
- 145
- Total EPA violations on record
- 7%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
City of Sunnyvale has 145 recorded EPA violations, 80% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 19% carry more. 7% of this system's own violations are health-based (10 of 145), and it ranks #278 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
145 Higher than most more violations than 80% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 580 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 7/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/29/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 7/29/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTA | 7/29/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOA | 7/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/29/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 7/29/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFPeA | 7/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/29/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/17/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/17/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 8:2 FTS | 7/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/17/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 7/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
Population served record for City of Sunnyvale
EPA SDWIS lists 157,566 people served and 28,372 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
145 violations · 157,566 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with City of Sunnyvale
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in California compares on the same EPA violation measures. California systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.