San Francisco Baykeeper v. Sunnyvale

Background

San Francisco Baykeeper sued the Cities of Sunnyvale and Mountain View under the citizen-suit provision of the Clean Water Act. Baykeeper alleged that the Cities improperly managed their storm sewers, allowing contaminated stormwater to discharge into waterbodies and cause elevated bacteria levels.

Baykeeper collected samples and sent them to three laboratories, including Alpha Analytical Laboratories, Inc. The laboratories’ final reports were produced in discovery. The underlying raw data and quality-assurance documents were not produced, and the Cities did not specifically request them before fact discovery closed on May 28, 2021.

During the bench trial in June 2025, an Alpha Analytical witness testified that the laboratory could not verify its final results against the underlying data because Alpha Analytical had destroyed the raw data and quality-assurance documents under its five-year document-retention policy. The Cities then moved for sanctions based on alleged destruction of evidence, or spoliation. They argued that Baykeeper was responsible because it had requested the testing in anticipation of the lawsuit. The Cities sought either exclusion of Alpha Analytical’s final reports or a conclusive finding that the reports deserved little or no evidentiary weight.

Legal standard

The motion relied on the court’s inherent authority to impose sanctions. The court explained that it would ordinarily first determine whether spoliation occurred by considering whether the party controlling the evidence had a duty to preserve it, whether the evidence was destroyed with a blameworthy state of mind, and whether the evidence was relevant. If spoliation occurred, the court would then consider the level of fault, the opposing party’s prejudice, and whether a lesser sanction could prevent substantial unfairness.

Court’s reasoning

The court did not decide whether the Cities filed their motion on time or whether Baykeeper engaged in conduct warranting sanctions. Instead, it held that the requested remedies were disproportionate even assuming those points in the Cities’ favor.

The court described exclusion of the reports and giving them nearly zero weight as practically similar and exceptionally harsh because the Alpha Analytical results were among the most extensive testing in the case. Without them, Baykeeper might have little possibility of prevailing. Such severe sanctions therefore required a high degree of fault by Baykeeper, significant prejudice to the Cities, or both.

The court found that Baykeeper’s responsibility was not too great. The raw data were not in Baykeeper’s possession or custody. At most, Baykeeper had indirect control because Alpha Analytical might have produced the data if asked. The court was unaware of authority requiring a litigating party to impose a preservation hold on a third party under such circumstances or to collect all potentially relevant evidence from that third party. Still, Baykeeper did not tell the Cities that the raw data and quality-assurance documents existed or warn them about Alpha Analytical’s retention policy. The court said Baykeeper, a sophisticated Clean Water Act litigant represented by experienced counsel, should have been more attentive.

The court also found that the Cities likely suffered minimal prejudice, if any. The Cities did not request the underlying data during nearly the entire case, despite having experienced counsel, water-department employees, and experts who could have recognized the likely existence and potential importance of underlying testing data. Their conduct suggested that the missing documents were less important than the final results themselves.

Disposition

The court DENIED the Cities’ motion for spoliation sanctions. It allowed the Cities to vigorously cross-examine an Alpha Analytical witness about the reliability of the results, including the inability to verify those results because the underlying data and quality-assurance documents were destroyed. The court stated that it would consider that testimony with the rest of the trial evidence when making its final decision.