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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

MS0410033 , Old Union Water System

22 of the 57 analytes this system has been tested for have been detected at least once, across 412 samples on record.

The other 35 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 412 samples on record, detections range from October 1, 2003 to February 10, 2026. These figures cover the whole record; the list of samples further down is narrowed.

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 Old Union Water System, 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 156 of 156 results Aug 28, 2007 Sep 19, 2025
Lead 1030 Inorganic Chemical 66 of 156 results Aug 28, 2007 Sep 19, 2025
Barium 1010 Inorganic Chemical 30 of 30 results Oct 1, 2003 Mar 12, 2025
Fluoride 1025 Inorganic Chemical 23 of 30 results Oct 1, 2003 Mar 12, 2025
Nickel 1036 Inorganic Chemical 12 of 30 results Mar 1, 2004 Mar 12, 2025
Chromium 1020 Inorganic Chemical 11 of 30 results Oct 1, 2003 Apr 20, 2015
Selenium 1045 Inorganic Chemical 10 of 30 results Oct 1, 2003 Feb 25, 2009
Arsenic 1005 Inorganic Chemical 9 of 30 results Apr 1, 2019 Mar 12, 2025
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 23, 2019 Feb 18, 2025
TTHM 2950 Organic Chemical 8 of 25 results Aug 23, 2007 May 14, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 7 of 25 results Sep 30, 2009 Feb 10, 2026
Xylenes, Total 2955 Organic Chemical 6 of 66 results Feb 9, 2004 Aug 25, 2014
Dibromochloromethane 2944 Organic Chemical 5 of 20 results Oct 6, 2020 May 14, 2025
Monochloroacetic Acid 2450 Organic Chemical 4 of 20 results Aug 23, 2007 Feb 10, 2026
Bromoform 2942 Organic Chemical 4 of 20 results Oct 6, 2020 May 14, 2025
Bromodichloromethane 2943 Organic Chemical 4 of 20 results Oct 6, 2020 Jan 6, 2025
Sulfate 1055 Inorganic Chemical 4 of 6 results Oct 1, 2003 Mar 1, 2004
Ethylbenzene 2992 Organic Chemical 3 of 66 results Sep 20, 2005 Mar 8, 2006
Chloroform 2941 Organic Chemical 2 of 20 results Oct 6, 2020 Sep 9, 2024
Carbon Tetrachloride 2982 Organic Chemical 1 of 66 results Jun 21, 2022 Jun 21, 2022
Cadmium 1015 Inorganic Chemical 1 of 30 results Feb 25, 2009 Feb 25, 2009
Dichloromethane 2964 Organic Chemical 1 of 66 results Aug 9, 2004 Aug 9, 2004

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 21–30 of 44 samples, newest first — collected May 14, 2025 to September 17, 2025. The summary above covers all 44.

26 results from the 10 samples listed here: 7 detected, 19 not detected. Across the whole record it is 376 of 2,552. 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 7 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 Old Union Water System, every result from 21 to 30 of 44 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
Sep 17, 2025 12:15
Sampling point
LC0008 Location withheld
Sample type
Routine
Lab sample
PB-250918-021
Laboratory
MSDH Lab
0.295 mg/l , sample collected Sep 17, 2025 12:15, sampling point LC0008 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 17, 2025 12:15, sampling point LC0008 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 11:50
Sampling point
LC0026 Location withheld
Sample type
Routine
Lab sample
PB-250918-019
Laboratory
MSDH Lab
0.0645 mg/l , sample collected Sep 17, 2025 11:50, sampling point LC0026 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 17, 2025 11:50, sampling point LC0026 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 11:40
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-250918-027
Laboratory
MSDH Lab
0.237 mg/l , sample collected Sep 17, 2025 11:40, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 17, 2025 11:40, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 11:15
Sampling point
LC0002 Location withheld
Sample type
Routine
Lab sample
PB-250918-025
Laboratory
MSDH Lab
0.384 mg/l , sample collected Sep 17, 2025 11:15, sampling point LC0002 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 17, 2025 11:15, sampling point LC0002 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 09:45
Sampling point
LC0019 Location withheld
Sample type
Routine
Lab sample
PB-250918-023
Laboratory
MSDH Lab
0.0088 mg/l , sample collected Sep 17, 2025 09:45, sampling point LC0019 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 17, 2025 09:45, sampling point LC0019 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 10:10
Sampling point
LC0013 Location withheld
Sample type
Routine
Lab sample
PB-250918-020
Laboratory
MSDH Lab
0.219 mg/l , sample collected Sep 17, 2025 10:10, sampling point LC0013 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.7 ug/l , sample collected Sep 17, 2025 10:10, sampling point LC0013 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 10, 2025 11:00
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
CN-250911-001
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 10, 2025 11:00, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 10, 2025 11:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-250911-003
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 10, 2025 11:30, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 10, 2025 12:15
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250911-002
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 10, 2025 12:15, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
May 14, 2025 13:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-148731-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 13:00, sampling point SM1 TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025

Routine (10).