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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

MS0540004 , Town of Como

24 of the 56 analytes this system has been tested for have been detected at least once, across 201 samples on record.

The other 32 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 201 samples on record, detections range from October 13, 2003 to February 19, 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 Como, 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 55 of 55 results Aug 13, 2007 Sep 19, 2023
Lead 1030 Inorganic Chemical 31 of 55 results Aug 13, 2007 Sep 19, 2023
TTHM 2950 Organic Chemical 21 of 21 results Jul 26, 2004 Feb 19, 2026
Barium 1010 Inorganic Chemical 18 of 18 results Oct 13, 2003 Mar 26, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 17 of 20 results Jun 24, 2010 Feb 19, 2026
Chloroform 2941 Organic Chemical 16 of 16 results Sep 6, 2007 Feb 19, 2026
Fluoride 1025 Inorganic Chemical 16 of 18 results Oct 13, 2003 Mar 26, 2025
Bromodichloromethane 2943 Organic Chemical 15 of 16 results Jun 24, 2010 Feb 19, 2026
Dichloroacetic Acid 2451 Organic Chemical 14 of 15 results Jun 24, 2010 Feb 19, 2026
Trichloroacetic Acid 2452 Organic Chemical 14 of 15 results Jun 24, 2010 Feb 19, 2026
Dibromochloromethane 2944 Organic Chemical 10 of 16 results Jun 24, 2010 Aug 7, 2025
Chromium 1020 Inorganic Chemical 10 of 18 results Oct 13, 2003 Mar 26, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 15, 2011 Jul 31, 2012
Dibromoacetic Acid 2454 Organic Chemical 4 of 15 results Jun 24, 2010 Nov 18, 2020
Nickel 1036 Inorganic Chemical 3 of 18 results Oct 23, 2019 Mar 26, 2025
Bromoform 2942 Organic Chemical 3 of 16 results Jun 24, 2010 May 29, 2019
Monochloroacetic Acid 2450 Organic Chemical 2 of 15 results Aug 7, 2025 Aug 7, 2025
Arsenic 1005 Inorganic Chemical 2 of 18 results Oct 23, 2019 Oct 23, 2019
Sodium 1052 Inorganic Chemical 2 of 2 results Sep 30, 2019 Sep 30, 2019
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 41 results Nov 20, 2013 Nov 20, 2013
Nitrate 1040 Inorganic Chemical 2 of 41 results Nov 20, 2013 Nov 20, 2013
Nitrite 1041 Inorganic Chemical 1 of 41 results Dec 8, 2005 Dec 8, 2005
Thallium, Total 1085 Inorganic Chemical 1 of 18 results Apr 20, 2005 Apr 20, 2005
Selenium 1045 Inorganic Chemical 1 of 18 results Oct 13, 2003 Oct 13, 2003

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 21–30 of 201 samples, newest first — collected September 19, 2023 to April 3, 2024. The summary above covers all 201.

22 results from the 10 samples listed here: 10 detected, 12 not detected. Across the whole record it is 270 of 1,061. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for Town of Como, every result from 21 to 30 of 201 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
Apr 3, 2024 13:46
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-240404-071
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 13:46, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 13:46, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 13:46, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Apr 3, 2024 13:10
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-240404-070
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2024 13:10, 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 Apr 3, 2024 13:10, 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 Apr 3, 2024 13:10, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Sep 19, 2023 07:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-025
Laboratory
MSDH Lab
0.0413 mg/l , sample collected Sep 19, 2023 07:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 07:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 08:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-024
Laboratory
MSDH Lab
0.00734 mg/l , sample collected Sep 19, 2023 08:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 08:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-023
Laboratory
MSDH Lab
0.0209 mg/l , sample collected Sep 19, 2023 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 06:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-022
Laboratory
MSDH Lab
0.0508 mg/l , sample collected Sep 19, 2023 06:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
1.17 ug/l , sample collected Sep 19, 2023 06:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 13:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-021
Laboratory
MSDH Lab
0.0959 mg/l , sample collected Sep 19, 2023 13:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 13:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 07:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-020
Laboratory
MSDH Lab
0.11 mg/l , sample collected Sep 19, 2023 07:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.762 ug/l , sample collected Sep 19, 2023 07:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-018
Laboratory
MSDH Lab
0.00257 mg/l , sample collected Sep 19, 2023 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 19, 2023 06:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230922-017
Laboratory
MSDH Lab
0.00653 mg/l , sample collected Sep 19, 2023 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 19, 2023 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).