A federal judge has hit the cities of Sunnyvale and Mountain View with hefty penalties after years of stormwater discharges polluted local creeks, racking up more than a thousand violations of the Clean Water Act. The court found repeated bacterial contamination in Stevens Creek and Calabazas Creek that exceeded state water-quality limits, and ordered each city to pay $1,178,400 in civil penalties.
San Francisco Baykeeper, which sued the cities in February 2020, said in a press release that the court held the municipalities responsible for 1,208 Clean Water Act violations. The group said its sampling detected E. coli readings up to 50 times legal limits, with evidence pointing to human fecal contamination. According to Baykeeper, the case finally went to trial in June 2025 after the cities repeatedly sought dismissal, and the ruling marks what the group called a long-overdue step toward better protections for local creeks and the Bay.
U.S. District Judge Edward J. Davila wrote that the violations involved actual pollution, not just paperwork violations and could pose public-health risks, as reported by SFGATE. The court concluded the cities were liable for failing to meet water-quality standards since 2019 and imposed the fines noted above. Davila did not immediately spell out the specific fixes the cities must make, instead telling the parties to propose next steps to cut pollution.
What the cities say
The City of Sunnyvale said it takes its environmental responsibilities seriously and described the litigation as complex, pointing to years of testing and investments in stormwater programs, according to a statement on the city's website. Sunnyvale also emphasized that some of the remedies urged by Baykeeper could be expensive and noted that the creeks are not used for swimming.
Mountain View, for its part, is keeping its cards close for now. City spokesperson Lenka Wright said, "At this time, no final determination has been made regarding next steps, and the city will provide updates as the matter progresses," as reported by SFGATE.
What happens next
The judge left it to the parties to propose remedies and said he would later decide on any injunctive orders. San Francisco Baykeeper argues that the cities should invest in Bay-friendly infrastructure that captures pollution before it hits storm drains, along with long-term monitoring. Baykeeper says targeted upgrades and stronger oversight are needed to protect recreation and public health, and the organization says it looks forward to the cities complying with the law and cleaning up the creeks.
Legal implications
Baykeeper brought the case under the Clean Water Act's citizen-suit provision (33 U.S.C. § 1365), which allows nonprofit groups to seek penalties and court-ordered cleanups, according to court filings on Justia Dockets. Municipal stormwater discharges are regulated through NPDES permits overseen by the State Water Resources Control Board, a framework that will be central to any compliance plan the judge orders. More on that permitting system is available from the State Water Resources Control Board. Civil penalties and injunctions are common outcomes when courts find ongoing discharges of pollutants from MS4 systems.
For residents, the ruling likely means closer scrutiny of local stormwater programs and, in time, on-the-ground infrastructure work to reduce runoff into creeks and the Bay. City officials and Baykeeper both say the process ahead will take time as technical plans are developed and reviewed. In the meantime, city messaging continues to remind the public that urban creeks are not intended for swimming and can carry harmful bacteria, especially after rain.
