Lake William Water System: DWP Reports No Known or Suspected Lead Service Lines in Inventory

LAKE WILLIAMS, SAN BERNARDINO COUNTY — November 9, 2026. Big Bear Lake DWP says its system-wide inventory found no known or suspected lead service lines and provides a separate Lake William inventory record; the finding is not a household plumbing test.

What DWP has published

The City of Big Bear Lake Department of Water and Power says it completed a water-service-line material inventory under the federal Lead and Copper Rule Revisions. On its public Water Quality & Supply page, it reports that the inventory found no known or suspected lead service lines within the surveyed utility system. The page links separate documentation for Big Bear, Fawnskin and the Lake William system.

What the inventory does not prove

A utility service-line inventory describes the line materials examined or classified under that program. It is not a laboratory test of the water coming from a particular tap, does not inspect every pipe or fixture inside a private home, and does not eliminate the possibility of lead exposure from privately owned plumbing components. Do not read ‘no known or suspected lead lines’ as a guarantee that every Lake Williams property is lead-free.

Water quality has a separate report

The water provider also publishes an annual Consumer Confidence Report for the Lake William system. The existing Lake Williams News report covering the 2025 water-quality filing describes the utility’s three wells, storage and water production. Residents comparing lead-related questions should review both the service-line inventory and the latest water-quality results rather than treating them as the same document.

How customers can check their own service

Ask DWP whether your property is actually served by the Lake William system and how the line material for your address was classified. Contact the utility at (909) 866-5050 and use the current report or test information for household-specific concerns. Some Lake Williams properties also use private wells, for which utility inventory records may not apply.

Primary source and corrections

City of Big Bear Lake Department of Water and Power — Water Quality & Supply: Lead Service Line Inventory. This source-backed local public-information article distinguishes documents from conditions or services that have not been independently verified. Residents and public agencies can send updated records or corrections through the local newspaper’s Contact page.

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