OHA Drinking Water Services
OR41 00225 CORVALLIS, CITY OF Classification: COMMUNITY
Contact: CHAD MARSHALL OR TOM HUBBARD Phone: 541-754-1758 View on Map
PO BOX 1083 County: BENTON
CORVALLIS, OR 97339 Activity Status: Active -- History
Population: 61,468 Number of Connections: 17,489
Operating Period: January 1 to December 31 Regulating Agency: REGION 2
Certified Operator(s) Owner Type: LOCAL GOVERNMENT
Required: Y Licensed By: N/A
Distribution class: 4 Last Survey Date:  Aug 13, 2024 - Outstanding Performer!
Treatment class: 4
Filtration Endorsement Required: No Source Water Protection Status

Sources
Facility ID Facility Name Activity Status Availability Source Type
EP-A EP FOR TAYLOR WTP A SW
SRC-AA WILLAMETTE RIVER A Permanent SW
EP-B EP FOR ROCK CREEK WTP A SW
SRC-BA NORTH FORK ROCK CREEK RES A Permanent SW
SRC-BB SOUTH FORK ROCK CREEK A Permanent SW
SRC-BC GRIFFITH CREEK A Permanent SW
SRC-BD ROCK CREEK (EMERGENCY) I Emergency SW
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Treatment
Facility ID Facility Name Filter Type Giardia Removal
Credit		 Treatment Process Treatment Objective
WTP-A TP FOR TAYLOR WTP Conventional Filtration 2.5-logFILTRATION, RAPID SAND PARTICULATE REMOVAL
HYPOCHLORINATION, POST DISINFECTION
HYPOCHLORINATION, PRE DISINFECTION
PH/ALKA ADJ-SODA ASH CORROSION CONTROL
FLUORIDATION OTHER
COAGULATION PARTICULATE REMOVAL
FLOCCULATION PARTICULATE REMOVAL
PH ADJUSTMENT, PRE PARTICULATE REMOVAL
RAPID MIX PARTICULATE REMOVAL
SEDIMENTATION PARTICULATE REMOVAL
PERMANGANATE TASTE / ODOR CONTROL
WTP-B TP FOR ROCK CREEK WTP Conventional Filtration 2.5-logFILTRATION, RAPID SAND PARTICULATE REMOVAL
HYPOCHLORINATION, POST DISINFECTION
HYPOCHLORINATION, PRE DISINFECTION
PH/ALKA ADJ-SODA ASH CORROSION CONTROL
FLUORIDATION OTHER
COAGULATION PARTICULATE REMOVAL
FLOCCULATION PARTICULATE REMOVAL
PH ADJUSTMENT, PRE PARTICULATE REMOVAL
RAPID MIX PARTICULATE REMOVAL
SEDIMENTATION PARTICULATE REMOVAL
PERMANGANATE TASTE / ODOR CONTROL

Consumer Confidence Reports (Last 5 Years)
For Year Date Received Date Certified
2024 4/30/2025 4/30/2025
2023 6/3/2024 5/30/2024
2022 6/23/2023 6/23/2023
2021 3/11/2022 3/11/2022
2020 6/9/2021 6/9/2021

Cross Connection/Backflow Prevention Information (Last 3 Records)
Enabling Authority Received Annual Summary Report Cross Connection Fee Status
Yes (pdf) 2024 - Received (pdf)
2023 - Received (pdf)
2022 - Received (pdf)
2021 - Received (pdf)
2020 - Received (pdf)
 2025 - Paid
2024 - Paid
2023 - Paid
2022 - Paid
2021 - Paid

More information for this water system: SDWIS ID 3884
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