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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 21–30 of 244 samples, newest first — collected October 9, 2023 to April 3, 2024. The summary above covers all 244.

40 results from the 10 samples listed here: 14 detected, 26 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.

We withheld the location of 6 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Oktoc Water Association #1, every result from 21 to 30 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
Apr 3, 2024 11:30
Sampling point
TF104 Treatment Facility TF104
Sample type
Routine
Lab sample
NI-240404-027
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 11:30, sampling point TF104 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 11:30, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 11:30, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Apr 3, 2024 12:10
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
NI-240404-026
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 12:10, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 12:10, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 12:10, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Feb 7, 2024 11:45
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-240208-021
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0494 mg/l , sample collected Feb 7, 2024 11:45, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.189 mg/l , sample collected Feb 7, 2024 11:45, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 11:45, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 8, 2024 13:30
Sampling point
TF103 Treatment Facility TF103
Sample type
Routine
Lab sample
IN-240109-053
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.059 mg/l , sample collected Jan 8, 2024 13:30, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.0011 mg/l , sample collected Jan 8, 2024 13:30, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.136 mg/l , sample collected Jan 8, 2024 13:30, sampling point TF103 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 8, 2024 13:30, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Oct 13, 2023 07:25
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-231018-009
Laboratory
MSDH Lab
0.116 mg/l , sample collected Oct 13, 2023 07:25, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2023 07:25, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Oct 11, 2023 07:10
Sampling point
LC0018 Location withheld
Sample type
Routine
Lab sample
PB-231018-012
Laboratory
MSDH Lab
0.188 mg/l , sample collected Oct 11, 2023 07:10, sampling point LC0018 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 11, 2023 07:10, sampling point LC0018 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Oct 11, 2023 07:40
Sampling point
LC0020 Location withheld
Sample type
Routine
Lab sample
PB-231018-011
Laboratory
MSDH Lab
0.0611 mg/l , sample collected Oct 11, 2023 07:40, sampling point LC0020 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.6 ug/l , sample collected Oct 11, 2023 07:40, sampling point LC0020 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Oct 9, 2023 06:00
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-231018-007
Laboratory
MSDH Lab
0.0232 mg/l , sample collected Oct 9, 2023 06:00, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.5 ug/l , sample collected Oct 9, 2023 06:00, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Oct 9, 2023 09:40
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-231018-006
Laboratory
MSDH Lab
0.123 mg/l , sample collected Oct 9, 2023 09:40, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.7 ug/l , sample collected Oct 9, 2023 09:40, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Oct 9, 2023 06:00
Sampling point
LC0023 Location withheld
Sample type
Routine
Lab sample
PB-231018-004
Laboratory
MSDH Lab
0.0624 mg/l , sample collected Oct 9, 2023 06:00, sampling point LC0023 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 9, 2023 06:00, sampling point LC0023 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).