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.
| 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 11–20 of 246 samples, newest first — collected August 27, 2024 to September 9, 2025. The summary above covers all 246.
44 results from the 10 samples listed here: 21 detected, 23 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 4 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| 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 |
|
||
| Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 15:00, sampling point SM4 | Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 | Jul 1, 2024 – Sep 30, 2024 |
| 0.6 ug/l , sample collected Aug 27, 2024 15:00, sampling point SM4 | Chloroform 2941 EPA method 524.2 | Not recorded |
| 1.1 ug/l , sample collected Aug 27, 2024 15:00, sampling point SM4 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 1.3 ug/l , sample collected Aug 27, 2024 15:00, sampling point SM4 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 2.1 ug/l , sample collected Aug 27, 2024 15:00, sampling point SM4 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 5.1 ug/l , sample collected Aug 27, 2024 15:00, sampling point SM4 | TTHM 2950 EPA method 524.2 | Jul 1, 2024 – Sep 30, 2024 |
|
||
| Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 27, 2024 14:30, sampling point SM3 | Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 | Jul 1, 2024 – Sep 30, 2024 |
| 0.68 ug/l , sample collected Aug 27, 2024 14:30, sampling point SM3 | Chloroform 2941 EPA method 524.2 | Not recorded |
| 1.1 ug/l , sample collected Aug 27, 2024 14:30, sampling point SM3 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 1.2 ug/l , sample collected Aug 27, 2024 14:30, sampling point SM3 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.9 ug/l , sample collected Aug 27, 2024 14:30, sampling point SM3 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 4.88 ug/l , sample collected Aug 27, 2024 14:30, sampling point SM3 | TTHM 2950 EPA method 524.2 | Jul 1, 2024 – Sep 30, 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
-
- Collected
- Aug 27, 2024 15:00
- Sampling point
- SM4 Location withheld
- Sample type
- Routine
- Lab sample
- 810-117977-2
- Laboratory
- Eurofins Eaton Analytical South Bend in
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 2 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
- Result
- Not detected below 2 ug/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2024 – Sep 30, 2024
-
Chloroform 2941 EPA method 524.2
- Result
- 0.6 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- 1.1 ug/l
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 1.3 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 2.1 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 5.1 ug/l
- Monitoring period
- Jul 1, 2024 – Sep 30, 2024
-
- Collected
- Aug 27, 2024 14:30
- Sampling point
- SM3 Location withheld
- Sample type
- Routine
- Lab sample
- 810-117977-1
- Laboratory
- Eurofins Eaton Analytical South Bend in
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 2 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
- Result
- Not detected below 2 ug/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2024 – Sep 30, 2024
-
Chloroform 2941 EPA method 524.2
- Result
- 0.68 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- 1.1 ug/l
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 1.2 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.9 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 4.88 ug/l
- Monitoring period
- Jul 1, 2024 – Sep 30, 2024
Routine (10).