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WASTEWATER TREATMENT PLANT UPGRADES

Phase 1 Improvements amount to nearly $26 million dollars. The City is investigating a regionalization alternative with the City of Walla Walla throughout 2022. The City is planning to make filter/mechanical improvements throughout 2023 with decision making on a large holding basin vs. piping cleaned effluent to City of Walla Walla option to be decided upon by end of 2023. 
WWTP Map 
PUBLIC NOTICE
DETERMINATION OF NON-SIGNIFICANCE
ENVIRONMENTAL CHECKLIST
LAND TREATMENT - ABRIDGED ENG. REPORT
GEOTECHNICAL REPORT
BIOLOGICAL ASSESSMENT
CRITICAL AREAS REPORT
WETLAND DELINEATION REPORT
 WWTP PHASE 1 PLANS





Contact
Public Works Director Robert McAndrews
Em: rmcandrews@cpwa.us
Ph: (509)-394-8526

The College Place Wastewater Facility Plant Upgrade is required as part of the City's permit renewal from the State for operating the wastewater system. The full upgrade is divided over four phases over a period of twenty years. Phase 1 is construction of an impoundment, upgrade the sequencing batch reactors, replacing equipment, and acquisition of additional land 80 acres (completed) for farming operations for water soluable crops that absorb the treated Class B wastewater. Phase 1 improvements will go through 2023 and have an estimated price tag of $26 million. This project has been within the city's six year Capital Facility Plan since 2017. It is being driven solely by State Permitting Regulations. The City is working with State, Federal, and other partners to submit a variety of grants to help pay for the projects to try to cushion the amount of utility rate increases needed to fund the State mandated project. A flier summarizing the project is located here. 

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Planning & Engineering7 documents

  • Wastewater Treatment Plant Facility Plan
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    Facility plan required by State to maintain system permit.
  • Wastewater Facility Plan - State Acceptance Amendment 1
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    Document detailing state acceptance of Wastewater Facility Plan
  • Wastewater Facility Plan - Signed
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    Wastewater Treatment Plant Facility Plan Signed By Engineer
  • CP 80 Final Deed Document
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    Final deed document to 80 acres purchased from State DNR for WWTP Expansion to satisfy state regulations.
  • Resolution 19-028
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    Resolution 19-028 permitted the acquisition of the College Place 80 property.
  • Regionalization Study
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    Regionalization Study
  • Regionalization Powerpoint
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    Regionalization Powerpoint

Grants & Loans1 document

  • State Ecology WQCFAA Grant & Loan Contract
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    Contract for $2.5 million to undertake complete final engineering for the Wastewater Treatment Plant renovation and begin improvements.

ConstructionNo documents