OHA Drinking Water Services
OR41
PWS ID: 00869 ---- THE DALLES, CITY OF
Coliform Summary History

Note: Samples for a given monitoring period are due 10 days after period end date. Therefore the most recent monitoring periods may show zero samples reported. This does not mean the water system is out of compliance.

Number of Samples Reported
Abbreviations: TC+: Total Coliform Positive, EC+: E. Coli Positive
Include results older than 2022
Period End Date Routines Required Routines Reported Routine TC+ Routine EC+ Repeats Reported Repeat TC+ Repeat EC+ Period Type
Jul 31, 2025 15 000000MN
Jun 30, 2025 15 3100000MN
May 31, 2025 15 3100000MN
Apr 30, 2025 15 3700000MN
Mar 31, 2025 15 3100000MN
Feb 28, 2025 15 2800000MN
Jan 31, 2025 15 3300000MN
Dec 31, 2024 15 3000000MN
Nov 30, 2024 15 3000000MN
Oct 31, 2024 15 3100000MN
Sep 30, 2024 15 3100000MN
Aug 31, 2024 15 2300000MN
Jul 31, 2024 15 2300000MN
Jun 30, 2024 15 3000000MN
May 31, 2024 15 3100000MN
Apr 30, 2024 15 2900000MN
Mar 31, 2024 15 2200000MN
Feb 29, 2024 15 3000000MN
Jan 31, 2024 15 2300000MN
Dec 31, 2023 15 3000000MN
Nov 30, 2023 15 3000000MN
Oct 31, 2023 15 3510300MN
Sep 30, 2023 15 3010300MN
Aug 31, 2023 10 3100000MN
Jul 31, 2023 10 3100000MN
Jun 30, 2023 10 3100000MN
May 31, 2023 10 3000000MN
Apr 30, 2023 10 2900000MN
Mar 31, 2023 10 2400000MN
Feb 28, 2023 10 3000000MN
Jan 31, 2023 10 3600000MN
Dec 31, 2022 10 2200000MN
Nov 30, 2022 10 3700000MN
Oct 31, 2022 10 2100000MN
Sep 30, 2022 10 2800000MN
Aug 31, 2022 10 2700000MN
Jul 31, 2022 10 2100000MN
Jun 30, 2022 10 2700000MN
May 31, 2022 10 2700000MN
Apr 30, 2022 10 2700000MN
Mar 31, 2022 10 2700000MN
Feb 28, 2022 10 2000000MN
Jan 31, 2022 10 2200000MN
Include results older than 2022

More information for this water system: SDWIS ID 3916
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