Central San Offices & Permits

5019 Imhoff Place
Martinez, CA 94553
(925) 228-9500
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Hours of Operation

Emergencies & Treatment Plant: 24 hours
Headquarters: Monday-Friday, 8am-5pm
Permit Counter: Monday-Friday, 8am-4pm
Inspection: Monday-Friday, 7am-3pm

Operations are closed on the following holidays:

• 01/20/25 Martin Luther King, Jr. Day
• 02/12/25 Lincoln’s Birthday
• 02/17/25 Washington’s Birthday
• 05/26/25 Memorial Day
• 06/19/25 Juneteenth
• 07/04/25 Independence Day
• 09/01/25 Labor Day
• 11/11/25 Veterans’ Day
• 11/27/25 Thanksgiving
• 11/28/25 District Holiday
• 12/24/25 Christmas Eve
• 12/25/25 Christmas Day
• 12/31/25 New Year’s Eve
• 01/01/26 New Year’s Day

Household Hazardous Waste Collection Facility

4797 Imhoff Place
Martinez, CA 94553
(800) 646-1431
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Hours of Operation

Residents: Monday-Saturday, 7am-2pm
Reuse Room: Monday-Saturday, 7am-1:30pm
Small Businesses: Monday-Saturday, by appt only

HHW Facility is closed on the following holidays:

• 01/20/25 Martin Luther King, Jr. Day
• 02/12/25 Lincoln’s Birthday
• 02/17/25 Washington’s Birthday
• 04/01/25 Facility Maintenance Closure
• 04/23/25 Recycled Water Fill Station & Reuse Room Closed (HHW will remain open)
• 05/26/25 Memorial Day
• 06/19/25 Juneteenth
• 07/04/25 Independence Day
• 09/01/25 Labor Day
• 11/11/25 Veterans’ Day
• 11/27/25 Thanksgiving
• 11/28/25 District Holiday
• 12/24/25 – 01/01/26 Holidays

Central San Treatment Plant (Shipping & Receiving, Contractors Entrance)

5019 Imhoff Place
Martinez, CA 94553
(925) 228-9500
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Hours of Operation

Emergencies & Treatment Plant: 24 hours

Access from Treatment Plant gate on Imhoff Drive between Imhoff Place and Solano Way (see red icon on map).

RV Wastewater Disposal Station

5300 Imhoff Drive
Martinez, CA 94553
(925) 228-9500
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Located on Imhoff Drive between Imhoff Place and Solano Way, next to the Treatment Plant entrance (yellow icon on map).

Hours of Operation

24 hours daily