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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.

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

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 51–60 of 412 samples, newest first — collected June 8, 2022 to March 19, 2024. The summary above covers all 412.

65 results from the 10 samples listed here: 18 detected, 47 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 2 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 51 to 60 of 412 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
Mar 19, 2024 14:10
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-240320-031
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 19, 2024 14:10, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 19, 2024 14:10, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 19, 2024 14:10, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
May 24, 2023 14:40
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230525-017
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 24, 2023 14:40, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
May 24, 2023 14:40
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230525-017
Laboratory
MSDH Lab
2.35 ug/l , sample collected May 24, 2023 14:40, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Sep 27, 2022 13:50
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-220928-056
Laboratory
MSDH Lab
0.0008 mg/l , sample collected Sep 27, 2022 13:50, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.115 mg/l , sample collected Sep 27, 2022 13:50, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.116 mg/l , sample collected Sep 27, 2022 13:50, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0012 mg/l , sample collected Sep 27, 2022 13:50, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:50, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Sep 27, 2022 13:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-220928-055
Laboratory
MSDH Lab
0.0008 mg/l , sample collected Sep 27, 2022 13:30, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.115 mg/l , sample collected Sep 27, 2022 13:30, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.108 mg/l , sample collected Sep 27, 2022 13:30, sampling point TF102 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0011 mg/l , sample collected Sep 27, 2022 13:30, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:30, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Sep 27, 2022 13:00
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
IN-220928-054
Laboratory
MSDH Lab
0.0008 mg/l , sample collected Sep 27, 2022 13:00, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.113 mg/l , sample collected Sep 27, 2022 13:00, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.114 mg/l , sample collected Sep 27, 2022 13:00, sampling point TF103 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0011 mg/l , sample collected Sep 27, 2022 13:00, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 27, 2022 13:00, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jun 21, 2022 14:00
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
VO-220622-008
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Dichloromethane 2964 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
0.972 ug/l , sample collected Jun 21, 2022 14:00, sampling point TF103 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Benzene 2990 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Toluene 2991 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 21, 2022 14:00, sampling point TF103 Styrene 2996 EPA method 524.2 Jan 1, 2022 – Dec 31, 2027
Collected
Jun 8, 2022 06:00
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-220609-019
Laboratory
MSDH Lab
0.0037 mg/l , sample collected Jun 8, 2022 06:00, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 8, 2022 06:00, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jun 8, 2022 06:00
Sampling point
LC0007 Location withheld
Sample type
Routine
Lab sample
PB-220609-018
Laboratory
MSDH Lab
0.0031 mg/l , sample collected Jun 8, 2022 06:00, sampling point LC0007 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 8, 2022 06:00, sampling point LC0007 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
Collected
Jun 8, 2022 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220609-017
Laboratory
MSDH Lab
0.0355 mg/l , sample collected Jun 8, 2022 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022
4.6 ug/l , sample collected Jun 8, 2022 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2022

Routine (10).