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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

MS0100009 , Town of Weir

20 of the 57 analytes this system has been tested for have been detected at least once, across 246 samples on record.

The other 37 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 246 samples on record, detections range from October 12, 1993 to February 11, 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 Town of Weir, 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 142 of 151 results Oct 12, 1993 Sep 9, 2025
Lead 1030 Inorganic Chemical 107 of 151 results Oct 12, 1993 Sep 9, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 23 of 23 results May 3, 2004 Feb 11, 2026
Nitrate 1040 Inorganic Chemical 23 of 23 results May 3, 2004 Feb 11, 2026
TTHM 2950 Organic Chemical 15 of 20 results Jun 5, 2007 Feb 11, 2026
Bromoform 2942 Organic Chemical 13 of 15 results Jun 5, 2007 Feb 11, 2026
Dibromochloromethane 2944 Organic Chemical 12 of 15 results Jun 5, 2007 Feb 11, 2026
Barium 1010 Inorganic Chemical 11 of 11 results Mar 19, 2002 Jan 15, 2025
Nickel 1036 Inorganic Chemical 9 of 11 results Jan 12, 2004 Jan 15, 2025
Bromodichloromethane 2943 Organic Chemical 6 of 15 results Feb 29, 2024 Feb 11, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 6 of 21 results Jun 5, 2007 Feb 18, 2025
Chromium 1020 Inorganic Chemical 5 of 11 results Jan 12, 2004 Jan 15, 2025
Selenium 1045 Inorganic Chemical 4 of 11 results Jan 12, 2004 Mar 24, 2008
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 23, 2019 Oct 14, 2024
Chloroform 2941 Organic Chemical 3 of 15 results Feb 29, 2024 Aug 27, 2024
Nitrite 1041 Inorganic Chemical 2 of 23 results Jan 24, 2011 Jan 23, 2013
Monochloroacetic Acid 2450 Organic Chemical 1 of 15 results Apr 16, 2019 Apr 16, 2019
Dichloroacetic Acid 2451 Organic Chemical 1 of 15 results Sep 14, 2017 Sep 14, 2017
Fluoride 1025 Inorganic Chemical 1 of 11 results Apr 21, 2014 Apr 21, 2014
Cadmium 1015 Inorganic Chemical 1 of 11 results Feb 16, 2005 Feb 16, 2005

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 31–40 of 246 samples, newest first — collected July 6, 2022 to March 21, 2023. The summary above covers all 246.

20 results from the 10 samples listed here: 13 detected, 7 not detected. Across the whole record it is 388 of 855. 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 8 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 Town of Weir, every result from 31 to 40 of 246 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 21, 2023 13:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230322-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 21, 2023 13:00, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2023
Collected
Jan 24, 2023 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-230125-042
Laboratory
MSDH Lab
0.441 mg/l , sample collected Jan 24, 2023 13:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
0.441 mg/l , sample collected Jan 24, 2023 13:00, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 24, 2023 13:00, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Jul 7, 2022 06:00
Sampling point
LC0020 Location withheld
Sample type
Routine
Lab sample
PB-220708-034
Laboratory
MSDH Lab
0.169 mg/l , sample collected Jul 7, 2022 06:00, sampling point LC0020 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
3.3 ug/l , sample collected Jul 7, 2022 06:00, sampling point LC0020 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 07:00
Sampling point
LC0013 Location withheld
Sample type
Routine
Lab sample
PB-220708-038
Laboratory
MSDH Lab
0.0834 mg/l , sample collected Jul 6, 2022 07:00, sampling point LC0013 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 07:00, sampling point LC0013 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 06:00
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-220708-040
Laboratory
MSDH Lab
0.0227 mg/l , sample collected Jul 6, 2022 06:00, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 06:00, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 07:00
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-220708-037
Laboratory
MSDH Lab
0.049 mg/l , sample collected Jul 6, 2022 07:00, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 07:00, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 06:00
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-220708-036
Laboratory
MSDH Lab
0.102 mg/l , sample collected Jul 6, 2022 06:00, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
15.8 ug/l , sample collected Jul 6, 2022 06:00, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 07:00
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-220708-039
Laboratory
MSDH Lab
0.0068 mg/l , sample collected Jul 6, 2022 07:00, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 07:00, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 05:00
Sampling point
LC0019 Location withheld
Sample type
Routine
Lab sample
PB-220708-035
Laboratory
MSDH Lab
0.156 mg/l , sample collected Jul 6, 2022 05:00, sampling point LC0019 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 6, 2022 05:00, sampling point LC0019 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 6, 2022 06:00
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-220708-033
Laboratory
MSDH Lab
0.101 mg/l , sample collected Jul 6, 2022 06:00, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.5 ug/l , sample collected Jul 6, 2022 06:00, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).