As we prepare for the possibility of El Niño weather this winter, Ironhouse Sanitary District is committed to helping Oakley and Bethel Island residents stay informed and ready. A little preparation today can go a long way toward protecting homes, neighborhoods, and the wastewater infrastructure that serves our community. Please take a moment to review the information below about how winter storms may impact the sewer system and the important role residents can play in protecting public health and the environment.

How Winter Storms Can Impact the Sewer System

Heavy winter storms can impact Ironhouse Sanitary District's sewer system by allowing excess rainwater to enter sewer pipes through cracks, damaged connections, or open sewer cleanouts. This can increase flows and place added stress on sewer pipes, pump stations, and wastewater treatment facilities.

The District is committed to protecting public health, maintaining reliable wastewater infrastructure, and safeguarding the environment for Oakley and Bethel Island. Forecasted El Niño conditions may bring heavy rainfall, high tides, strong winds, and localized flooding, particularly in low-lying areas of Bethel Island.

The District is responsible for wastewater collection, conveyance, treatment, and recycled water services. During severe weather events, residents should also follow guidance issued by Contra Costa County, Contra Costa County Sheriff's Office, Oakley Police Department,  Contra Costa Fire Protection District,  and emergency management officials.

Severe weather associated with El Niño conditions may result in:

• Localized flooding on roads and properties.
• Temporary power outages.
• Increased groundwater infiltration into sewer infrastructure.
• Debris accumulation in waterways and drainage areas.
• Travel delays and restricted roadway access.
• Increased flows to wastewater lift stations due to groundwater infiltration and storm-related impacts.

What Residents Can Do

Protect the Sewer System

Residents can help prevent sewer system problems by:

• Flushing only the "3 Ps": Pee, Poop, and Toilet Paper.
• Never flushing wipes, paper towels, feminine hygiene products, grease, fats, or oils.
• Properly disposing of household chemicals, paint, and hazardous materials. Residents can bring these items to Delta Diablo Hazardous Waste Collection Facility.
• Reporting wastewater backups, overflows, or other sewer-related concerns to Ironhouse immediately: (925) 625-2279.

Bethel Island Residents: Sewer Cleanouts

Because Bethel Island is located in a low-lying Delta environment, residents should remain especially vigilant during periods of prolonged rainfall, elevated tides, and strong storm systems. Flooding, roadway impacts, and temporary access restrictions may occur more quickly than in surrounding areas. In 2023, Ironhouse Sanitary District crews worked around the clock during winter storms to remove nearly one million gallons of stormwater and wastewater from the Bethel Island sewer system, helping prevent backups and keep the system operating safely. Bethel Island residents should inspect their sewer cleanout and make sure it remains closed. Cleanouts are not designed to carry excess stormwater runoff to our wastewater treatment plant. Residents should also repair damaged sewer laterals to keep stormwater out of sewer pipes. Sewer cleanouts, if left open, can flood your home. Ironhouse Sanitary District has the authority to levy fines up to $1,000 if cleanouts or manhole covers are opened to drain stormwater into the sewer system.