Project Updates

We’ve completed installing 4,252 linear feet of new sewer lines on Sierra Way, Ella, Ruth, George, and Henry Streets, and 3,595 linear feet of new sewer lines on Mill, Morro, Toro, and Santa Rosa Streets to keep the sewer system reliable for everyone. Construction for these projects began in early 2025. 

We're upgrading vital groundwork to enhance the reliability, capacity, and safety of our water and sewer systems in San Luis Obispo.

These projects are not just about replacing aging pipes; they're investments in a resilient, efficient, and sustainable future for our community. Here's how we're improving key services for our residents, businesses, and public spaces:

Project Details

The 2025 Sewer & Waterline Projects are primarily focused on replacing aging sewer pipes and waterlines on sections of Ella Street, Sierra Way, California Boulevard, and Mill Street to ensure reliable, efficient service for the community, but they also present opportunities to support key City goals such as sustainability, capacity enhancements, and minimizing future maintenance costs. Objectives include:

• Replacement of almost 8,000 linear feet of aging sewer mains
• Potential installation of 350 linear feet of additional sewer pipes
• Upgrade of 810 linear feet of water transmission mains
• Reduced emergency repair costs
• Re-paving areas of impact

Quick Facts: Sewer & Water Infrastructure Replacement

• These projects upgrade underground sewer and water pipes to improve reliability, capacity, and safety.
• Work involves excavating trenches along roadways to replace aging underground lines.
• Projects focus on utilities only and usually do not include full street resurfacing.
• Construction zones may have open trenches, dirt piles, and heavy equipment like excavators and loaders.
• Steel plates may temporarily cover trenches when work is paused.
• Traffic control measures such as cones, barriers, and signage help guide vehicles and pedestrians safely.
• Lane reductions, limited access, and temporary loss of on-street parking may occur.
• Trenches are backfilled and repaved, typically restoring only the narrow strip of pavement above the excavation.
• Only sections of the street directly affected by the work receive new pavement.
• Project timelines vary based on weather, site conditions, and unexpected utility conflicts.

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