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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0530014 , Oktoc Water Association #1

29 of the 58 analytes this system has been tested for have been detected at least once, across 244 samples on record.

The other 29 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 244 samples on record, detections range from October 13, 2003 to August 3, 2026. These figures cover the whole record.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Oktoc Water Association #1, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 60 of 60 results Aug 14, 2007 Oct 13, 2023
Lead 1030 Inorganic Chemical 25 of 60 results Aug 14, 2007 Oct 11, 2023
Barium 1010 Inorganic Chemical 22 of 22 results Oct 13, 2003 Dec 4, 2024
Fluoride 1025 Inorganic Chemical 21 of 22 results Oct 13, 2003 Dec 4, 2024
Chromium 1020 Inorganic Chemical 16 of 22 results Oct 13, 2003 Dec 4, 2024
TTHM 2950 Organic Chemical 13 of 17 results Aug 29, 2007 Mar 6, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 12 of 18 results Aug 29, 2007 Mar 6, 2025
Dichloroacetic Acid 2451 Organic Chemical 7 of 13 results Aug 21, 2013 Mar 6, 2025
Dibromochloromethane 2944 Organic Chemical 7 of 13 results Aug 21, 2013 Nov 6, 2024
Bromoform 2942 Organic Chemical 6 of 13 results May 20, 2024 Nov 6, 2024
Gross Alpha, Incl. Radon & U 4002 Radionuclide 6 of 6 results Mar 15, 2012 Nov 19, 2013
Sodium 1052 Inorganic Chemical 5 of 5 results Oct 14, 2019 Aug 3, 2026
Nitrate-Nitrite 1038 Inorganic Chemical 5 of 55 results Dec 4, 2019 Apr 1, 2025
Nitrite 1041 Inorganic Chemical 5 of 55 results Jul 9, 2008 Apr 1, 2025
Chloroform 2941 Organic Chemical 5 of 13 results Aug 21, 2013 Mar 6, 2025
Nickel 1036 Inorganic Chemical 5 of 22 results Mar 15, 2004 Dec 4, 2024
Bromodichloromethane 2943 Organic Chemical 5 of 13 results Aug 21, 2013 Aug 21, 2024
Selenium 1045 Inorganic Chemical 5 of 22 results Apr 4, 2005 May 5, 2020
Dibromoacetic Acid 2454 Organic Chemical 4 of 13 results May 20, 2024 Aug 21, 2024
Trichloroacetic Acid 2452 Organic Chemical 2 of 13 results Mar 6, 2025 Mar 6, 2025
Monochloroacetic Acid 2450 Organic Chemical 2 of 13 results May 20, 2024 May 20, 2024
Nitrate 1040 Inorganic Chemical 2 of 55 results Dec 4, 2019 Dec 4, 2019
Gross Alpha Particle Activity 4109 Radionuclide 2 of 2 results Sep 12, 2013 Sep 12, 2013
Xylenes, Total 2955 Organic Chemical 2 of 35 results Jul 30, 2013 Jul 30, 2013
Monobromoacetic Acid 2453 Organic Chemical 1 of 13 results Oct 8, 2020 Oct 8, 2020
Arsenic 1005 Inorganic Chemical 1 of 22 results May 5, 2020 May 5, 2020
Thallium, Total 1085 Inorganic Chemical 1 of 22 results May 5, 2020 May 5, 2020
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 8 results Sep 12, 2013 Sep 12, 2013
Radium-226 4020 Radionuclide 1 of 8 results Sep 12, 2013 Sep 12, 2013

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 41–50 of 244 samples, newest first — collected April 14, 2021 to June 22, 2022. The summary above covers all 244.

52 results from the 10 samples listed here: 4 detected, 48 not detected. Across the whole record it is 249 of 1,490. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for Oktoc Water Association #1, every result from 41 to 50 of 244 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Jun 22, 2022 13:10
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-220623-002
Laboratory
MSDH Lab
3.42 ug/l , sample collected Jun 22, 2022 13:10, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Jun 22, 2022 13:10
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-220623-002
Laboratory
MSDH Lab
11.5 ug/l , sample collected Jun 22, 2022 13:10, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
May 11, 2022 11:30
Sampling point
TF104 Treatment Facility TF104
Sample type
Routine
Lab sample
RU-220512-002
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 11, 2022 11:30, sampling point TF104 Combined Uranium 4006 EPA method 200.8 Jan 1, 2014 – Dec 31, 2022
Collected
May 11, 2022 11:15
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
RU-220512-001
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 11, 2022 11:15, sampling point TF103 Combined Uranium 4006 EPA method 200.8 Jan 1, 2014 – Dec 31, 2022
Collected
Nov 17, 2021 10:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
RU-211118-001
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 17, 2021 10:30, sampling point TF101 Combined Uranium 4006 EPA method 200.8 Jan 1, 2013 – Dec 31, 2021
Collected
Oct 20, 2021 11:55
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-211021-024
Laboratory
MSDH Lab
6.71 ug/l , sample collected Oct 20, 2021 11:55, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Oct 20, 2021 11:55
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-211021-024
Laboratory
MSDH Lab
5.64 ug/l , sample collected Oct 20, 2021 11:55, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Oct 5, 2021 12:20
Sampling point
TF104 Treatment Facility TF104
Sample type
Routine
Lab sample
VO-211006-006
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Dichloromethane 2964 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Benzene 2990 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Toluene 2991 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 12:20, sampling point TF104 Styrene 2996 EPA method 524.2 Jan 1, 2021 – Dec 31, 2026
Collected
Oct 5, 2021 11:45
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
VO-211006-005
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Dichloromethane 2964 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Benzene 2990 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Toluene 2991 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 11:45, sampling point TF103 Styrene 2996 EPA method 524.2 Jan 1, 2018 – Dec 31, 2023
Collected
Apr 14, 2021 14:05
Sampling point
TF104 Treatment Facility TF104
Sample type
Routine
Lab sample
NI-210415-032
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 14:05, sampling point TF104 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 14:05, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 14:05, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021

Routine (10).