LAKE WILLIAMS, San Bernardino County — November 8, 2026. Homeowners served by Big Bear Lake Department of Water and Power’s Lake William drinking-water system can now review the latest published annual water-quality report, covering tests performed in 2025. It provides concrete information about the small system serving this part of the Big Bear Valley.
Where does Lake William water come from?
According to the utility’s 2025 Consumer Confidence Report for the Lake William system, the system uses three groundwater wells and a reservoir with 160,000 gallons of storage. The department reports producing about 10 million gallons of water in 2025. It also lists four portable generators and two portable booster pumps available for emergency operations.
What does the testing information show?
The report covers the monitoring period January 1–December 31, 2025 and explains detected substances, limits and whether the particular measurements were associated with reportable violations. The table lists zero positive total-coliform bacteria samples for 2025 and nitrate not detected in the annual measurement shown. Some other chemical entries reflect older scheduled tests. These historical report values should not be mistaken for a real-time laboratory result at a particular household tap.
Why conservation matters in Lake Williams
The utility emphasizes that its mountain water supply is drawn from local groundwater rather than imported state water, and is recharged through precipitation. Even when water-quality tests meet standards, the amount of available water can become a concern. On its water-supply and conservation page, the utility provides seasonal outdoor-watering rules, leak-repair requirements and other tips for customers.
What should residents check?
People who do not know their actual water provider should confirm their service account before applying this report to their address. Customers can request the most recent water-quality information, any current advisories or a printed report from Big Bear Lake DWP at (909) 866-5050. Its office is at 41972 Garstin Drive, Big Bear Lake. The department also describes its public board meetings and offers additional documentation on its official website.
Primary source: City of Big Bear Lake Department of Water and Power, Lake William System 2025 Consumer Confidence Report, published for customer review in 2026. No claim is made about unreported November 2026 test results.
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