OHA Drinking Water Services
OR41
PWS ID: 06118 ---- COLUMBIA HILLS HOA
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
Apr 01, 2026 DIST-A 1 1 0.45 0.4Y
Mar 01, 2026 DIST-A 1 1 0.46 0.4Y
Feb 01, 2026 DIST-A 1 1 0.41 0.4Y
Jan 01, 2026 DIST-A 1 1 0.52 0.4Y
Dec 01, 2025 DIST-A 1 1 0.33 0.4Y
Nov 01, 2025 DIST-A 1 1 0.1 0.4Y
Oct 01, 2025 DIST-A 1 1 0.29 0.4Y
Sep 01, 2025 DIST-A 1 0 0.5Y
Aug 01, 2025 DIST-A 1 1 0.89 0.5Y
Jul 01, 2025 DIST-A 1 1 0.22 0.4Y
Jun 01, 2025 DIST-A 1 1 0.51 0.4Y
May 01, 2025 DIST-A 1 1 0.32 0.4Y
Apr 01, 2025 DIST-A 1 1 0.69 0.4Y
Mar 01, 2025 DIST-A 1 1 0.45 0.4Y
Feb 01, 2025 DIST-A 1 1 0.2 0.4Y
Jan 01, 2025 DIST-A 1 1 0.1 0.4Y
Dec 01, 2024 DIST-A 4 4 0.4 0.5Y
Nov 01, 2024 DIST-A 1 1 0.48 0.6Y
Oct 01, 2024 DIST-A 1 1 0.7 0.7Y