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; 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 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

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 11–18 of 18 samples, newest first — collected October 14, 2024 to September 9, 2025. The summary above covers all 18.

22 results from the 8 samples listed here: 11 detected, 11 not detected. 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 3 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 11 to 18 of 18 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 9, 2025 07:10 Sampling point LC0013 Location withheld Sample type Routine Lab sample PB-250910-104 Laboratory MSDH Lab
0.063 mg/l , sample collected Sep 9, 2025 07:10, sampling point LC0013	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 9, 2025 07:10, sampling point LC0013	Lead 1030 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Collected Sep 9, 2025 04:38 Sampling point LC0019 Location withheld Sample type Routine Lab sample PB-250910-106 Laboratory MSDH Lab
0.205 mg/l , sample collected Sep 9, 2025 04:38, sampling point LC0019	Copper, Free 1022 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.5 ug/l , sample collected Sep 9, 2025 04:38, sampling point LC0019	Lead 1030 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Collected May 20, 2025 13:10 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample CN-250521-018 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 20, 2025 13:10, sampling point TF080	Cyanide 1024 EPA method QC10204001X	Jan 1, 2023 – Dec 31, 2025
Collected Feb 18, 2025 13:45 Sampling point SM4 Location withheld Sample type Routine Lab sample HA-250219-003 Laboratory MSDH Lab
6.01 ug/l , sample collected Feb 18, 2025 13:45, sampling point SM4	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2025 – Dec 31, 2025
Collected Feb 18, 2025 13:45 Sampling point SM4 Location withheld Sample type Routine Lab sample TH-250219-003 Laboratory MSDH Lab
4.57 ug/l , sample collected Feb 18, 2025 13:45, sampling point SM4	TTHM 2950 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Collected Jan 29, 2025 12:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample NI-250130-030 Laboratory MSDH Lab
0.449 mg/l , sample collected Jan 29, 2025 12:30, sampling point TF080	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
0.449 mg/l , sample collected Jan 29, 2025 12:30, sampling point TF080	Nitrate 1040 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2025 12:30, sampling point TF080	Nitrite 1041 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Collected Jan 15, 2025 09:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample IN-250116-027 Laboratory MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 15, 2025 09:30, sampling point TF080	Arsenic 1005 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0272 mg/l , sample collected Jan 15, 2025 09:30, sampling point TF080	Barium 1010 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 15, 2025 09:30, sampling point TF080	Cadmium 1015 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0006 mg/l , sample collected Jan 15, 2025 09:30, sampling point TF080	Chromium 1020 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 15, 2025 09:30, sampling point TF080	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 Jan 15, 2025 09:30, sampling point TF080	Mercury 1035 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.001 mg/l , sample collected Jan 15, 2025 09:30, sampling point TF080	Nickel 1036 EPA method 200.8	Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 15, 2025 09:30, sampling point TF080	Selenium 1045 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 15, 2025 09:30, sampling point TF080	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 Jan 15, 2025 09:30, sampling point TF080	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 Jan 15, 2025 09:30, sampling point TF080	Thallium, Total 1085 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Collected Oct 14, 2024 09:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample NA-241015-001 Laboratory MSDH Lab
36.6 mg/l , sample collected Oct 14, 2024 09:30, sampling point TF080	Sodium 1052 EPA method 200.7	Jan 1, 2022 – Dec 31, 2024

Collected
Sep 9, 2025 07:10

Sampling point
LC0013 Location withheld

Sample type
Routine

Lab sample
PB-250910-104

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- Copper, Free 1022 EPA method 200.8
  
  Result
  0.063 mg/l
- Lead 1030 EPA method 200.8
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Sep 9, 2025 04:38

Sampling point
LC0019 Location withheld

Sample type
Routine

Lab sample
PB-250910-106

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- Copper, Free 1022 EPA method 200.8
  
  Result
  0.205 mg/l
- Lead 1030 EPA method 200.8
  
  Result
  0.5 ug/l
Collected
May 20, 2025 13:10

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
CN-250521-018

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Feb 18, 2025 13:45

Sampling point
SM4 Location withheld

Sample type
Routine

Lab sample
HA-250219-003

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  6.01 ug/l
Collected
Feb 18, 2025 13:45

Sampling point
SM4 Location withheld

Sample type
Routine

Lab sample
TH-250219-003

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- TTHM 2950 EPA method 524.2
  
  Result
  4.57 ug/l
Collected
Jan 29, 2025 12:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
NI-250130-030

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  0.449 mg/l
- Nitrate 1040 EPA method QC10107041C
  
  Result
  0.449 mg/l
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Jan 15, 2025 09:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
IN-250116-027

Laboratory
MSDH Lab
- Arsenic 1005 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Barium 1010 EPA method 200.8
  
  Result
  0.0272 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Cadmium 1015 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Chromium 1020 EPA method 200.8
  
  Result
  0.0006 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Fluoride 1025 EPA method QC 10-109-12-2-A
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Mercury 1035 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Nickel 1036 EPA method 200.8
  
  Result
  0.001 mg/l
  
  Monitoring period
  Not recorded
- Selenium 1045 EPA method 200.8
  
  Result
  Not detected below 0.0025 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Antimony, Total 1074 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Beryllium, Total 1075 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Thallium, Total 1085 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
Collected
Oct 14, 2024 09:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
NA-241015-001

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2024
- Sodium 1052 EPA method 200.7
  
  Result
  36.6 mg/l

Routine (8).