Water Treatment in San Bernardino County, CA

About the water in San Bernardino County

Most San Bernardino County utilities draw from local groundwater wells in the Bunker Hill, Chino, and Cucamonga basins, supplemented with imported State Water Project water from the California Department of Water Resources. The exact blend per city depends on which subbasin the wellfield sits in. (water source reference)

USGS hardness mapping places most of the western Inland Empire in the very hard range, with per-city finished water values in /lib/cities.ts ranging from roughly 10 to 18 grains per gallon. Local groundwater contributes most of the hardness load. State Water Project imports add some additional total dissolved solids on top. (USGS hardness map)

Utilities serving San Bernardino County

• San Bernardino Municipal Water Department, water quality and Consumer Confidence Reports
• Fontana Water Company, water quality and Consumer Confidence Reports
• Cucamonga Valley Water District, water quality and Consumer Confidence Reports
• City of Ontario Municipal Utilities, water quality and Consumer Confidence Reports

Common local concerns

• Calcium and magnesium hardness from Inland Empire groundwater basins
• Hexavalent chromium (Chromium-6) historical detections in the Inland Empire
• PFAS monitoring under the April 2024 EPA MCL rule
• Disinfection by-products (TTHM and HAA5) tracked in annual utility CCRs

Regulators and source data

• California State Water Resources Control Board, Division of Drinking Water
• EPA Safe Drinking Water Information System

Cities we serve in San Bernardino County

Each city below has its own service pages with water-quality detail specific to the local utility.

Nearby counties we serve

• Maricopa County, AZ

  8 cities served

• Clark County, NV

  2 cities served