San Pedro Water Hardness & Quality Report (2026)

San Pedro, California is served by the Los Angeles Department of Water and Power (LADWP) under Public Water System #090400036. The supply is a blend of water from the Owens Valley aqueduct and the State Water Project, distributed to the San Pedro harbor neighborhood via the LADWP South Bay district. LADWP publishes annual Consumer Confidence Reports covering detailed source, treatment, and contaminant data for the Los Angeles service area; residents may access these at ladwp.com or contact the Water Quality Hotline at (213) 367-3182 for specific parameters.

The LADWP South Bay district serves the southernmost Los Angeles harbor area, blending water from the Owens Valley aqueduct and the State Water Project. This south LADWP distribution zone shows a moderately soft supply in the San Pedro harbor area. The blended aqueduct sources, drawing from distant snowmelt and imported surface waters rather than local carbonate-heavy groundwater, contribute to the relatively lower mineral content characteristic of the southernmost harbor distribution zone.

With a moderately soft supply, San Pedro residents experience limited scale buildup on fixtures and appliances compared to harder water areas of Los Angeles County. Soap lathers effectively and significant descaling maintenance is generally not required for water heaters, dishwashers, or washing machines. While the broader Los Angeles area can experience harder water, the harbor district's position in the south LADWP distribution zone reflects softer characteristics. Residents should consult LADWP's annual Consumer Confidence Reports for current contaminant levels and compliance data.