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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

MS0490010 , City of Winona

22 of the 59 analytes this system has been tested for have been detected at least once, across 280 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 280 samples on record, detections range from October 8, 2003 to December 3, 2025. 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 City of Winona, 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 182 of 184 results Jun 17, 2004 Aug 7, 2024
Lead 1030 Inorganic Chemical 81 of 184 results Jun 17, 2004 Aug 7, 2024
TTHM 2950 Organic Chemical 11 of 20 results Jul 21, 2004 Aug 14, 2025
Barium 1010 Inorganic Chemical 10 of 10 results Oct 8, 2003 Apr 7, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 8 of 20 results Jun 16, 2010 Aug 14, 2025
Fluoride 1025 Inorganic Chemical 7 of 10 results Oct 8, 2003 Apr 7, 2025
Chloroform 2941 Organic Chemical 6 of 14 results Aug 12, 2013 Aug 14, 2025
Bromodichloromethane 2943 Organic Chemical 6 of 14 results Aug 12, 2013 Aug 14, 2025
Dibromochloromethane 2944 Organic Chemical 6 of 14 results Aug 12, 2013 Aug 14, 2025
Nickel 1036 Inorganic Chemical 5 of 10 results Mar 10, 2004 Apr 7, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 29, 2019 Dec 3, 2025
Dichloroacetic Acid 2451 Organic Chemical 3 of 15 results Aug 12, 2013 Aug 14, 2025
Chromium 1020 Inorganic Chemical 3 of 10 results Mar 7, 2016 Apr 7, 2025
Trichloroacetic Acid 2452 Organic Chemical 2 of 15 results Aug 12, 2013 Aug 14, 2025
Gross Beta Particle Activity 4100 Radionuclide 2 of 2 results Sep 25, 2009 Mar 15, 2010
Sulfate 1055 Inorganic Chemical 2 of 2 results Oct 8, 2003 Mar 10, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 15 results Sep 22, 2020 Sep 22, 2020
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 7 results Mar 15, 2010 Mar 15, 2010
Radium-226 4020 Radionuclide 1 of 7 results Mar 15, 2010 Mar 15, 2010
Gross Alpha, Excl. Radon & U 4000 Radionuclide 1 of 2 results Sep 25, 2009 Sep 25, 2009
Gross Alpha Particle Activity 4109 Radionuclide 1 of 2 results Sep 25, 2009 Sep 25, 2009
Mercury 1035 Inorganic Chemical 1 of 10 results Apr 6, 2005 Apr 6, 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 1–10 of 280 samples, newest first — collected August 6, 2024 to December 3, 2025. The summary above covers all 280.

44 results from the 10 samples listed here: 17 detected, 27 not detected. Across the whole record it is 343 of 915. 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.

Chemical and radiological sample results for City of Winona, every result from 1 to 10 of 280 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
Dec 3, 2025 07:35
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NA-251203-009
Laboratory
MSDH Lab
4.02 mg/l , sample collected Dec 3, 2025 07:35, sampling point TF080 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 07:46
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
CN-250917-021
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 17, 2025 07:46, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 17, 2025 07:38
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250917-025
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 17, 2025 07:38, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 14, 2025 10:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-160092-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 14, 2025 10:00, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
8.5 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
6 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 14, 2025 10:00, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 14, 2025 10:00, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
14.5 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
17 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2025 10:00, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
6.8 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
2.8 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
26.6 ug/l , sample collected Aug 14, 2025 10:00, sampling point SM2 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 7, 2025 15:18
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250408-047
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 7, 2025 15:18, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0983 mg/l , sample collected Apr 7, 2025 15:18, 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 Apr 7, 2025 15:18, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0014 mg/l , sample collected Apr 7, 2025 15:18, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.12 mg/l , sample collected Apr 7, 2025 15:18, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
0.0014 mg/l , sample collected Apr 7, 2025 15:18, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 7, 2025 15:18, 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 Apr 7, 2025 15:18, 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 Apr 7, 2025 15:18, 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 Apr 7, 2025 15:18, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Mar 25, 2025 15:10
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-250326-045
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 25, 2025 15:10, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 25, 2025 15:10, 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 Mar 25, 2025 15:10, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Mar 17, 2025 13:52
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250318-075
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 17, 2025 13:52, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0881 mg/l , sample collected Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 17, 2025 13:52, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, 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 Mar 17, 2025 13:52, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 7, 2024 05:30
Sampling point
LC073 Location withheld
Sample type
Routine
Lab sample
PB-240807-104
Laboratory
MSDH Lab
0.201 mg/l , sample collected Aug 7, 2024 05:30, sampling point LC073 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.7 ug/l , sample collected Aug 7, 2024 05:30, sampling point LC073 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 6, 2024 06:00
Sampling point
LC037 Location withheld
Sample type
Routine
Lab sample
PB-240807-122
Laboratory
MSDH Lab
0.112 mg/l , sample collected Aug 6, 2024 06:00, sampling point LC037 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 6, 2024 06:00, sampling point LC037 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 6, 2024 08:00
Sampling point
LC075 Location withheld
Sample type
Routine
Lab sample
PB-240807-121
Laboratory
MSDH Lab
0.14 mg/l , sample collected Aug 6, 2024 08:00, sampling point LC075 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 6, 2024 08:00, sampling point LC075 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024

Routine (10).