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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

MS0450007 , East Madison Water Assn-West

37 of the 61 analytes this system has been tested for have been detected at least once, across 742 samples on record.

The other 24 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 742 samples on record, detections range from October 6, 2003 to August 12, 2025. 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 East Madison Water Assn-West, 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 159 of 159 results Jun 17, 2004 Jul 30, 2024
Lead 1030 Inorganic Chemical 110 of 159 results Jun 17, 2004 Jul 29, 2024
TTHM 2950 Organic Chemical 104 of 104 results Jul 13, 2004 Aug 12, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 101 of 101 results Jul 13, 2004 Aug 12, 2025
Chloroform 2941 Organic Chemical 87 of 87 results Jun 12, 2007 Aug 12, 2025
Bromodichloromethane 2943 Organic Chemical 87 of 87 results Jun 12, 2007 Aug 12, 2025
Dichloroacetic Acid 2451 Organic Chemical 85 of 86 results Feb 26, 2008 Aug 12, 2025
Trichloroacetic Acid 2452 Organic Chemical 85 of 86 results Feb 26, 2008 Aug 12, 2025
Barium 1010 Inorganic Chemical 45 of 45 results Oct 6, 2003 Mar 11, 2025
Fluoride 1025 Inorganic Chemical 45 of 45 results Oct 6, 2003 Mar 11, 2025
Chromium 1020 Inorganic Chemical 31 of 45 results Oct 6, 2003 Jan 11, 2024
Dibromochloromethane 2944 Organic Chemical 26 of 87 results Dec 9, 2013 Aug 12, 2025
Bromoform 2942 Organic Chemical 22 of 87 results Dec 9, 2013 Aug 12, 2025
Dibromoacetic Acid 2454 Organic Chemical 21 of 86 results Dec 9, 2013 Dec 1, 2020
Monochloroacetic Acid 2450 Organic Chemical 21 of 86 results Dec 2, 2009 Jul 9, 2020
Gross Alpha, Incl. Radon & U 4002 Radionuclide 20 of 20 results Mar 13, 2012 Oct 12, 2012
Sodium 1052 Inorganic Chemical 15 of 15 results Sep 24, 2019 Feb 25, 2025
Monobromoacetic Acid 2453 Organic Chemical 13 of 86 results Feb 26, 2008 Sep 1, 2020
Nickel 1036 Inorganic Chemical 11 of 45 results Oct 6, 2003 Apr 9, 2019
Xylenes, Total 2955 Organic Chemical 9 of 79 results Feb 16, 2005 Apr 30, 2013
Gross Alpha, Excl. Radon & U 4000 Radionuclide 9 of 9 results Sep 22, 2009 Apr 3, 2012
Combined Radium (-226 & -228) 4010 Radionuclide 9 of 33 results Sep 22, 2009 Apr 3, 2012
Gross Alpha Particle Activity 4109 Radionuclide 9 of 13 results Sep 22, 2009 Apr 3, 2012
Radium-228 4030 Radionuclide 8 of 33 results Sep 22, 2009 Apr 3, 2012
Selenium 1045 Inorganic Chemical 7 of 45 results Dec 12, 2005 Apr 28, 2020
Radium-226 4020 Radionuclide 7 of 33 results Sep 22, 2009 Mar 12, 2010
Arsenic 1005 Inorganic Chemical 6 of 45 results Dec 12, 2005 Feb 13, 2024
Gross Beta Particle Activity 4100 Radionuclide 6 of 6 results Sep 22, 2009 Mar 12, 2010
Sulfate 1055 Inorganic Chemical 5 of 6 results Oct 6, 2003 Mar 10, 2004
Nitrite 1041 Inorganic Chemical 4 of 101 results Aug 15, 2005 Feb 28, 2023
Ethylbenzene 2992 Organic Chemical 3 of 79 results Feb 16, 2005 Oct 2, 2012
Antimony, Total 1074 Inorganic Chemical 2 of 45 results Mar 31, 2014 Mar 31, 2014
Thallium, Total 1085 Inorganic Chemical 1 of 45 results Apr 28, 2020 Apr 28, 2020
Carbon Tetrachloride 2982 Organic Chemical 1 of 79 results Apr 30, 2013 Apr 30, 2013
Cadmium 1015 Inorganic Chemical 1 of 45 results Dec 12, 2005 Dec 12, 2005
Cyanide 1024 Inorganic Chemical 1 of 42 results Apr 4, 2005 Apr 4, 2005
Dichloromethane 2964 Organic Chemical 1 of 79 results Aug 10, 2004 Aug 10, 2004

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 11–20 of 23 samples, newest first — collected October 8, 2024 to March 11, 2025. The summary above covers all 23.

16 results from the 10 samples listed here: 6 detected, 10 not detected. Across the whole record it is 1,177 of 4,007. 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 1 sampling point 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 East Madison Water Assn-West, every result from 11 to 20 of 23 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 11, 2025 08:25
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
NI-250311-070
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 08:25, sampling point TF105 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 11, 2025 08:25, sampling point TF105 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 08:25, sampling point TF105 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Mar 11, 2025 06:30
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
NI-250311-069
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 06:30, sampling point TF104 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 11, 2025 06:30, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 06:30, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Mar 11, 2025 07:05
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-250311-068
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 07:05, sampling point TF103 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 11, 2025 07:05, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 11, 2025 07:05, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Feb 25, 2025 09:20
Sampling point
TF107 Treatment Facility TF107
Sample type
Routine
Lab sample
NA-250226-005
Laboratory
MSDH Lab
165 mg/l , sample collected Feb 25, 2025 09:20, sampling point TF107 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 08:40
Sampling point
TF106 Old 16 and Hogue
Sample type
Routine
Lab sample
NA-250226-004
Laboratory
MSDH Lab
89.8 mg/l , sample collected Feb 25, 2025 08:40, sampling point TF106 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 08:55
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
NA-250226-003
Laboratory
MSDH Lab
90.6 mg/l , sample collected Feb 25, 2025 08:55, sampling point TF105 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 07:35
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
NA-250226-002
Laboratory
MSDH Lab
93.9 mg/l , sample collected Feb 25, 2025 07:35, sampling point TF104 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 08:10
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NA-250226-001
Laboratory
MSDH Lab
105 mg/l , sample collected Feb 25, 2025 08:10, sampling point TF103 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Oct 22, 2024 08:35
Sampling point
TF106 Old 16 and Hogue
Sample type
Routine
Lab sample
CN-241022-019
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 22, 2024 08:35, sampling point TF106 Cyanide 1024 EPA method QC10204001X Jan 1, 2022 – Dec 31, 2024
Collected
Oct 8, 2024 10:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-241009-016
Laboratory
MSDH Lab
9.72 ug/l , sample collected Oct 8, 2024 10:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2024 – Dec 31, 2024

Routine (10).