San Luis Obispo, California: water and wastewater capital improvement projects
115 line items · $170M · starting 2026–2031 · 1 plan
San Luis Obispo's published capital plans list 115 water, sewer and wastewater line items with a combined planning budget of $170M, of which 58 items worth $71M sit in the wastewater and sewer departments. The largest single item is Water - Pipeline Replacement at $37M (2030–2035). The ten largest items are listed below; the full list with descriptions and page references is in Klarifi.
A capital improvement plan (CIP) is a city’s multi-year budget for building and replacing infrastructure. The water, sewer and wastewater sections list each project with its budget and the years it is funded, which makes them the earliest public signal that a plant, pump station or pipe network is about to be upgraded, usually two to four years before a contract is awarded.
The largest water and sewer projects in San Luis Obispo
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | Water - Pipeline Replacement | Water Distribution | Water mains and distribution | $37M | 2030–2035 |
| 2 | Sewer - Pipeline Replacement | Sewer | Sewer rehabilitation and I&I | $23M | 2030–2035 |
| 3 | Water - Major Maintenance | Water Distribution | — | $22M | 2030–2035 |
| 4 | T-3 Water Storage Tank Replacement - High Pressure Zone | Sewer | Storage tanks and reservoirs | $10M | 2026–2030 |
| 5 | Waterline Replacement: Santa Rosa - Stenner Creek Road to Highland 30-inch | Water Distribution | Water mains and distribution | $9M | 2027–2028 |
| 6 | Whale Rock Pump Station Rehab (A and B) | Sewer | Pump stations | $5M | 2027–2028 |
| 7 | Sewer Lift Station Replacement - Airport | Sewer | Lift stations | $4M | 2025–2028 |
| 8 | Foothill - Chorro to California 24" Pipeline Inter-tie | Water Distribution | Water mains and distribution | $3M | 2029–2031 |
| 9 | Water Meter and Box | Water Distribution | Meters and AMI | $3M | 2025–2030 |
| 10 | Sewer-main Replacement: Chorro - Boysen to Rougeot | Sewer | Sewer rehabilitation and I&I | $3M | 2026–2027 |
105 more line items in San Luis Obispo, with descriptions and contacts
Klarifi holds every San Luis Obispo line item with its description, the page it appears on and the source document, plus 10 verified contacts at the city’s treatment plants. Track new plans as they are adopted and compare with similar projects in other cities.
Planned spend by start year
Before 2026
$30M
37 items
2026
$19M
13 items
2027
$19M
16 items
2028
$8M
9 items
2029
$7M
15 items
2030
$85M
13 items
2031
$724K
7 items
2032 and later
$519K
5 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 9 | $8M | 5% |
| Sewer | 49 | $63M | 37% |
| Water Supply | 23 | $5M | 3% |
| Water Distribution | 34 | $93M | 55% |
Project types in San Luis Obispo's plan
Wastewater treatment plants in San Luis Obispo
2 publicly owned treatment plants in San Luis Obispo with 149 permit violations in the last three years. Each profile shows flow, permit, technology and compliance data.
| Plant | Avg flow (MGD) | NPDES | Violations (3y) |
|---|---|---|---|
| San Luis Obispo WWTP | 4.23 | CAL049224 | 23 |
| California Mens Colony | — | CA0047856 | 126 |
Other California cities with capital plans
San Luis Obispo capital plan questions
Sources and methodology
Budgets and years are as published in San Luis Obispo’s capital improvement plan or adopted budget. Klarifi extracts the water, sewer and wastewater line items from the published document, keeps the page reference for each one, and assigns a project type from the title and description with a keyword classifier. Figures are planning budgets, not awarded contracts, and can change when a plan is re-adopted.
Documents: CIP 2025–2035 (115 line items).
Data refreshed September 11, 2026.