OHA Drinking Water Services
OR41 01542 LAKE OSWEGO - TIGARD WATER SUPPLY Classification: COMMUNITY - Wholesale
Contact: DAVE TROTTER Phone: 503-635-0392 View on Map
4260 KENTHORPE WAY County: CLACKAMAS
WEST LINN, OR 97068 Activity Status: Active Jan 01, 2020 -- History
Population: 105,000 Number of Connections: 2
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: None Last Survey Date:  Jul 19, 2022 - Outstanding Performer!
Treatment class: 4
Filtration Endorsement Required: No Source Water Protection Status - Award Granted! 09/2025

Sources
Facility ID Facility Name Activity Status Availability Source Type
EP-A EP FOR CLACKAMAS RIVER A SW
SRC-AA CLACKAMAS RIVER A Permanent SW
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Treatment
Facility ID Facility Name Filter Type Giardia Removal
Credit		 Treatment Process Treatment Objective
WTP-A TP FOR CLACKAMAS RIVER Conventional Filtration 2.5-logFILTRATION, RAPID SAND PARTICULATE REMOVAL
HYPOCHLORINATION, POST DISINFECTION
PH ADJ-CAUSTIC SODA CORROSION CONTROL
OZONATION, PRE DISINFECTION
COAGULATION PARTICULATE REMOVAL
FLOCCULATION PARTICULATE REMOVAL
RAPID MIX PARTICULATE REMOVAL
SEDIMENTATION PARTICULATE REMOVAL

Consumer Confidence Reports (Last 5 Years)
Only non-wholesale community water systems require consumer confidence reports.

Cross Connection/Backflow Prevention Information (Last 5 Years)
Enabling Authority Received Annual Summary Report Cross Connection Fee Status
Not received 2024 - Due 3/31/2025
2023 - Not received
2022 - Not received
2021 - Not received
2020 - Not received
 2026 - Not required
2025 - Not required
2024 - Not required
2023 - Not required
2022 - Not required

More information for this water system: SDWIS ID 5510
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