OHA Drinking Water Services
OR41 00660 WEST SLOPE WATER DISTRICT Classification: COMMUNITY
Contact: MIKE GRIMM Phone: 503-292-2777 View on Map
PO BOX 25140 County: WASHINGTON
PORTLAND, OR 97298 Activity Status: Active -- History
Population: 11,000 Number of Connections: 3,234
Operating Period: January 1 to December 31 Regulating Agency: REGION 1
Certified Operator(s) Owner Type: LOCAL GOVERNMENT
Required: Y Licensed By: N/A
Distribution class: 2 Last Survey Date:  May 11, 2021 - Outstanding Performer!
Treatment class: None
Filtration Endorsement Required: No Source Water Protection Status

Sources
Facility ID Facility Name Activity Status Availability Source Type
EP-A EP FOR PORTLAND WATER BUREAU A SW
SRC-AA PORTLAND WATER BUREAU (00657) A Permanent SWP
EP-B EP FOR TUALATIN VALLEY WD I SW
SRC-BA TUALATIN VALLEY WD (00665) I Emergency SWP
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Treatment
Facility ID Facility Name Filter Type Giardia Removal
Credit
Treatment Process Treatment Objective

Consumer Confidence Reports (Last 5 Years)
For Year Date Received Date Certified
2025 Due 7/1/2026 Due 7/11/2026
2024 6/30/2025 6/30/2025
2023 6/28/2024 6/28/2024
2022 Not received 8/31/2023
2021 Not received Not received

Cross Connection/Backflow Prevention Information (Last 5 Years)
Enabling Authority Received Annual Summary Report Cross Connection Fee Status
Yes (pdf) 2025 - Received (pdf)
2024 - Received (pdf)
2023 - Received (pdf)
2022 - Received (pdf)
2021 - Received (pdf)
2026 - Paid
2025 - Paid
2024 - Paid
2023 - Paid
2022 - Paid