WEST YOST
Sewer System Management Plan Update
City Council Meeting | September 8, 2026
WEST YOST
Background
Sewer System Management Plan Update | July 28, 2026
State Water Board Order No. 2022-0103-DWQ requires a Sewer System Management Plan (SSMP) for all sanitary sewer systems over one mile An SSMP must be updated every 6 years and approved by the City Council
An SSMP must be audited every 3 years to evaluate effectiveness and inform next update
WEST YOST
What is a Sewer System Management Plan (SSMP)?
• City’s roadmap for safely operating, maintaining, and improving the sewer collection system while complying with State regulations • Helps protect public health, environment, and City infrastructure by reducing sewer spills
SSMP Goals
Sewer System Management Plan Update | July 28, 2026
1. Operate &
Maintain
Keep the collection
system functioning
reliably
2. Ensure
Capacity
Ensure adequate
capacity for current
and future flows
3. Reduce
Sewer Spills
Minimize the
frequency and
volume of spills
4. Respond
Quickly
Rapid response,
cleanup, and
notification
WEST YOST
City’s Sewer System at a Glance
• 62 miles of gravity sewer main
• 1,660 manholes
• 4 miles of force mains
• 6 lift stations
• Conveys 1.2 million gallons per day to
Pinole-Hercules Water Pollution
Control Plant
• Average number of City spills per 100
miles over the last decade: 1.3
• Regional average: 3.9
Sewer System Management Plan Update | July 28, 2026
WEST YOST
Known Hot Spots
• 27 known hot spot locations
• Common problems include grease or root intrusion
Sewer System Management Plan Update | July 28, 2026
Inspection
Frequency Hot Spot Location
3 Months • Canterbury Footpath
• 148 Columbine
• Marigold & Columbine
4 Months
• Black Walnut & Silver
Maple
• Canterbury & Newbury
• 139 Beryl Court
• 127 Lapiz Court
6 Months
• Redwood &
Sycamore
• Redwood & Fir
• Redwood–Falcon @
Refugio
• Valley Rd Manzanita
• Turquoise &
Sycamore
• Hannah School
(Refugio Valley Rd)
• Sycamore
• Sycamore (Root
Issue)
• Bristol & Canterbury
• 226 Overlook
Terrace
• 211–214 Apollo
• Apollo
• 1003 Lavender
• Refugio Valley Rd
• 209 Ben Lomond
• N Wildwood
• Lupine & Sycamore
• Silver Maple & Black
Walnut
• Newbury
• Newbury from
Willow Ave
WEST YOST
SSMP Changes Since 2019
Sewer System Management Plan Update | July 28, 2026
Updated to reflect reissued Order’s element structure and terminology Revised spill emergency response procedures and reporting categories Updated to reflect organizational structure and staffing Updated to reflect current and planned operation and maintenance programs
WEST YOST
SSMP Changes Since 2019
Sewer System Management Plan Update | July 28, 2026
SSMP is certified
through CIWQS
database by the City’s
Legally Responsible
Official
Ongoing
implementation by
Public Works staff
Internal audits
conducted every three
years
Next comprehensive
update due
August 2, 2031
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Staff Recommendation
Sewer System Management Plan Update | July 28, 2026
• Adopt 2026 Sanitary Sewer Management Plan by resolution
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Questions and Discussion
Chris Morris, Public Works Superintendent
[email protected]
(510) 799-8252