OHA Drinking Water Services
OR41
PWS ID: 00203 ---- COLUMBIA CITY MUN WATERWORKS
Maximum Residual Disinfection Level (MRDL) Samples
MRDL Monitoring Requirements :: Excel Spreadsheet

Monitoring
Period
Entry
Point
Samples
Required
Samples
Collected
Period
Avg
Annual
Avg
Level
Compliance
Mar 01, 2026 DIST-A 2 2 0.57 0.6Y
Feb 01, 2026 DIST-A 2 2 0.64 0.6Y
Jan 01, 2026 DIST-A 2 2 0.7 0.6Y
Dec 01, 2025 DIST-A 2 2 0.67 0.6Y
Nov 01, 2025 DIST-A 2 2 0.32 0.6Y
Oct 01, 2025 DIST-A 2 2 0.52 0.6Y
Sep 01, 2025 DIST-A 2 2 0.66 0.6Y
Aug 01, 2025 DIST-A 2 2 0.51 0.6Y
Jul 01, 2025 DIST-A 2 2 0.67 0.6Y
Jun 01, 2025 DIST-A 2 2 0.565 0.6Y
May 01, 2025 DIST-A 2 2 0.5 0.6Y
Apr 01, 2025 DIST-A 2 2 0.66 0.7Y
Mar 01, 2025 DIST-A 2 2 0.66 0.7Y
Feb 01, 2025 DIST-A 2 2 0.69 0.7Y
Jan 01, 2025 DIST-A 2 2 0.74 0.7Y
Dec 01, 2024 DIST-A 2 2 0.72 0.6Y
Nov 01, 2024 DIST-A 2 2 0.53 0.6Y
Oct 01, 2024 DIST-A 2 2 0.66 0.7Y