OHA Drinking Water Services
OR41
PWS ID: 00194 ---- CLATSKANIE, CITY OF
Disinfectant Residual Monitoring Results

Disinfectant residual monitoring is applicable to all community and non-transient non-community water systems that use chlorine or chloramines as a disinfectant. Monitoring period averages are calculated from the chlorine residual measurements on total coliform samples, taken from the distribution system. These are displayed on the Coliform Results page.
The Maximum Residual Disinfectant Level (MRDL) for chlorine and chloramines is 4.0 mg/L, measured as free chlorine. Compliance with the MRDL is determined using the running annual average of monthly averages. Any running annual average that exceeds the MRDL is a violation and is indicated in bold red text.

Include results older than 2022
Monitoring
Period Begin		 Monitoring
Period End		 Monitoring
Period Name		 Samples
Required		 Samples
Collected		 Monitoring Period
Average (mg/L)		 Running Annual
Average (mg/L)
May 01, 2025 May 31, 2025 MAY2025 2 2 0.6 0.6
Apr 01, 2025 Apr 30, 2025 APR2025 2 2 0.69 0.5
Mar 01, 2025 Mar 31, 2025 MAR2025 2 2 0.66 0.5
Feb 01, 2025 Feb 28, 2025 FEB2025 2 2 0.8 0.5
Jan 01, 2025 Jan 31, 2025 JAN2025 2 2 0.63 0.5
Dec 01, 2024 Dec 31, 2024 DEC2024 2 2 0.77 0.5
Nov 01, 2024 Nov 30, 2024 NOV2024 2 2 0.23 0.5
Oct 01, 2024 Oct 31, 2024 OCT2024 2 2 0.46 0.5
Sep 01, 2024 Sep 30, 2024 SEP2024 2 2 0.65 0.5
Aug 01, 2024 Aug 31, 2024 AUG2024 5 5 0.16 0.5
Jul 01, 2024 Jul 31, 2024 JUL2024 2 2 0.4 0.5
Jun 01, 2024 Jun 30, 2024 JUN2024 2 2 0.60 0.5
May 01, 2024 May 31, 2024 MAY2024 2 2 0.33 0.5
Apr 01, 2024 Apr 30, 2024 APR2024 2 2 0.46 0.5
Mar 01, 2024 Mar 31, 2024 MAR2024 2 2 0.71 0.5
Feb 01, 2024 Feb 29, 2024 FEB2024 2 2 0.60 0.5
Jan 01, 2024 Jan 31, 2024 JAN2024 2 2 0.56 0.6
Dec 01, 2023 Dec 31, 2023 DEC2023 2 2 0.5 0.6
Nov 01, 2023 Nov 30, 2023 NOV2023 2 2 0.47 0.5
Oct 01, 2023 Oct 31, 2023 OCT2023 5 5 0.50 0.5
Sep 01, 2023 Sep 30, 2023 SEP2023 2 2 0.44 0.5
Aug 01, 2023 Aug 31, 2023 AUG2023 2 2 0.64 0.5
Jul 01, 2023 Jul 31, 2023 JUL2023 5 5 0.37 0.5
Jun 01, 2023 Jun 30, 2023 JUN2023 2 2 0.60 0.5
May 01, 2023 May 31, 2023 MAY2023 2 2 0.6 0.5
Apr 01, 2023 Apr 30, 2023 APR2023 2 2 0.50 0.5
Mar 01, 2023 Mar 31, 2023 MAR2023 2 2 0.81 0.5
Feb 01, 2023 Feb 28, 2023 FEB2023 2 2 0.73 0.4
Jan 01, 2023 Jan 31, 2023 JAN2023 2 2 0.56 0.4
Dec 01, 2022 Dec 31, 2022 DEC2022 2 2 0.23 0.4
Nov 01, 2022 Nov 30, 2022 NOV2022 2 2 0.20 0.5
Oct 01, 2022 Oct 31, 2022 OCT2022 2 2 0.54 0.5
Sep 01, 2022 Sep 30, 2022 SEP2022 2 2 0.69 0.5
Aug 01, 2022 Aug 31, 2022 AUG2022 2 2 0.36 0.5
Jul 01, 2022 Jul 31, 2022 JUL2022 2 2 0.2 0.5
Jun 01, 2022 Jun 30, 2022 JUN2022 2 2 0.42 0.5
May 01, 2022 May 31, 2022 MAY2022 2 2 0.49 0.5
Apr 01, 2022 Apr 30, 2022 APR2022 2 2 0.4 0.5
Mar 01, 2022 Mar 31, 2022 MAR2022 2 2 0.4 0.5
Feb 01, 2022 Feb 28, 2022 FEB2022 2 2 0.66 0.5
Jan 01, 2022 Jan 31, 2022 JAN2022 2 2 0.63 0.5



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