In existence since 1945, Ironhouse Sanitary District (ISD) utilizes a staff of 24 field and office personnel to maintain sanitary services for nearly 30,000 customers in the Oakley and Bethel Island area.  The district treats approximately 2 million gallons of wastewater every day at their treatment facility located near Walnut Meadows Drive, north of Highway 4 in Oakley.  Reclaimed water is spread on fields ISD owns near the Oakley plant, and on 3,600-acre Jersey Island.

The district’s unique name derives from Ironhouse School, which was a small schoolhouse that once served the families living in the rural area near Hotchkiss Tract. The school served much of the territory that today is encompassed by the sanitary district, so when it came time to select a name for ISD, the Ironhouse moniker seemed a natural fit.