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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

MS0450010 , City of Madison

46 of the 77 analytes this system has been tested for have been detected at least once, across 985 samples on record.

The other 31 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 985 samples on record, detections range from October 6, 2003 to July 15, 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 City of Madison, 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 245 of 245 results Aug 31, 2004 Jun 20, 2024
TTHM 2950 Organic Chemical 237 of 238 results Jul 14, 2004 Feb 11, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 231 of 241 results Mar 2, 2005 Feb 11, 2026
Chloroform 2941 Organic Chemical 149 of 152 results Aug 17, 2006 Feb 11, 2026
Bromodichloromethane 2943 Organic Chemical 142 of 152 results Aug 17, 2006 Feb 11, 2026
Dichloroacetic Acid 2451 Organic Chemical 133 of 147 results Oct 22, 2007 Feb 11, 2026
Trichloroacetic Acid 2452 Organic Chemical 129 of 147 results Oct 22, 2007 Feb 11, 2026
Lead 1030 Inorganic Chemical 126 of 245 results Aug 31, 2004 Jun 20, 2024
Dibromochloromethane 2944 Organic Chemical 90 of 152 results Oct 18, 2007 Feb 11, 2026
Bromoform 2942 Organic Chemical 43 of 152 results Oct 23, 2013 Oct 21, 2020
Fluoride 1025 Inorganic Chemical 42 of 42 results Oct 6, 2003 Jul 15, 2026
Barium 1010 Inorganic Chemical 37 of 37 results Oct 6, 2003 Jul 15, 2026
Dibromoacetic Acid 2454 Organic Chemical 33 of 147 results Jun 2, 2008 Oct 21, 2020
Chromium 1020 Inorganic Chemical 18 of 37 results Oct 6, 2003 Jan 9, 2024
Sodium 1052 Inorganic Chemical 17 of 17 results May 16, 2007 Feb 24, 2025
Monochloroacetic Acid 2450 Organic Chemical 16 of 147 results Apr 21, 2008 Jan 30, 2020
Sulfate 1055 Inorganic Chemical 10 of 10 results Oct 6, 2003 Mar 2, 2021
Radium-226 4020 Radionuclide 7 of 13 results Oct 2, 2018 Oct 2, 2019
Nickel 1036 Inorganic Chemical 6 of 33 results Oct 6, 2003 Sep 28, 2022
Calcium 1016 Inorganic Chemical 5 of 5 results May 16, 2007 Mar 2, 2021
Alkalinity, Total 1927 Water Quality 5 of 5 results May 16, 2007 Mar 2, 2021
Chloride 1017 Inorganic Chemical 4 of 5 results Mar 2, 2021 Mar 2, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 4 of 4 results Mar 2, 2021 Mar 2, 2021
Xylenes, Total 2955 Organic Chemical 4 of 72 results Jun 16, 2009 May 1, 2013
Color 1905 Water Quality 3 of 4 results Mar 2, 2021 Mar 2, 2021
Gross Alpha, Incl. Radon & U 4002 Radionuclide 3 of 7 results Oct 2, 2018 Oct 2, 2019
Monobromoacetic Acid 2453 Organic Chemical 3 of 147 results Apr 21, 2008 Apr 18, 2018
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 77 results Apr 26, 2016 Jul 15, 2026
Nitrate 1040 Inorganic Chemical 2 of 77 results Apr 26, 2016 Jul 15, 2026
Combined Radium (-226 & -228) 4010 Radionuclide 2 of 13 results Oct 2, 2018 Oct 2, 2018
Radium-228 4030 Radionuclide 2 of 13 results Oct 2, 2018 Oct 2, 2018
Selenium 1045 Inorganic Chemical 2 of 37 results Mar 29, 2004 Jan 19, 2010
Thallium, Total 1085 Inorganic Chemical 2 of 37 results Jan 19, 2010 Jan 19, 2010
Nitrite 1041 Inorganic Chemical 1 of 77 results Feb 28, 2023 Feb 28, 2023
Potassium 1042 Inorganic Chemical 1 of 1 result May 16, 2007 May 16, 2007
Residue, Total, Filterable 1057 Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Alkalinity, Caco3 Stability 1067 Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Carbon Dioxide 1901 Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Hardness, Total (As Caco3) 1915 Water Quality 1 of 1 result May 16, 2007 May 16, 2007
PH 1925 Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Iron, Field Result FEFD Inorganic Chemical 1 of 1 result May 16, 2007 May 16, 2007
Calculated Sodium NACA Water Quality 1 of 1 result May 16, 2007 May 16, 2007
PH, Field Result PHFD Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Temperature, Field Result TEMP Water Quality 1 of 1 result May 16, 2007 May 16, 2007
Cadmium 1015 Inorganic Chemical 1 of 37 results Apr 6, 2005 Apr 6, 2005
Mercury 1035 Inorganic Chemical 1 of 40 results Mar 29, 2004 Mar 29, 2004

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 281–290 of 985 samples, newest first — collected October 21, 2020 to February 23, 2021. The summary above covers all 985.

15 results from the 10 samples listed here: 11 detected, 4 not detected. Across the whole record it is 1,767 of 4,636. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Units in this table

Total Haloacetic Acids (Haa5) is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

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 City of Madison, every result from 281 to 290 of 985 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
Feb 23, 2021 09:50
Sampling point
TF105 Treatment Facility TF105
Sample type
Routine
Lab sample
CN-210223-008
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Feb 23, 2021 09:50, sampling point TF105 Cyanide 1024 EPA method QC10204001X Jan 1, 2019 – Dec 31, 2021
Collected
Jan 27, 2021 09:15
Sampling point
SM6 TCR Site 22 at Hamil's Restaurant
Sample type
Routine
Lab sample
TH-210128-021
Laboratory
MSDH Lab
33.3 ug/l , sample collected Jan 27, 2021 09:15, sampling point SM6 TTHM 2950 EPA method 524.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 10:10
Sampling point
SM5 Location withheld
Sample type
Routine
Lab sample
TH-210128-020
Laboratory
MSDH Lab
49.4 ug/l , sample collected Jan 27, 2021 10:10, sampling point SM5 TTHM 2950 EPA method 524.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 09:57
Sampling point
SM4 TCR Site 6 at Fire Sta #2
Sample type
Routine
Lab sample
TH-210128-019
Laboratory
MSDH Lab
48.6 ug/l , sample collected Jan 27, 2021 09:57, sampling point SM4 TTHM 2950 EPA method 524.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 08:50
Sampling point
SM3 TCR Site 18 at McHs
Sample type
Routine
Lab sample
TH-210128-018
Laboratory
MSDH Lab
28 ug/l , sample collected Jan 27, 2021 08:50, sampling point SM3 TTHM 2950 EPA method 524.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 09:15
Sampling point
SM6 TCR Site 22 at Hamil's Restaurant
Sample type
Routine
Lab sample
HA-210128-022
Laboratory
MSDH Lab
2.08 ug/l , sample collected Jan 27, 2021 09:15, sampling point SM6 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 10:12
Sampling point
SM5 Location withheld
Sample type
Routine
Lab sample
HA-210128-021
Laboratory
MSDH Lab
19.4 ug/l , sample collected Jan 27, 2021 10:12, sampling point SM5 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 09:55
Sampling point
SM4 TCR Site 6 at Fire Sta #2
Sample type
Routine
Lab sample
HA-210128-020
Laboratory
MSDH Lab
20.1 ug/l , sample collected Jan 27, 2021 09:55, sampling point SM4 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2021 – Mar 31, 2021
Collected
Jan 27, 2021 08:52
Sampling point
SM3 TCR Site 18 at McHs
Sample type
Routine
Lab sample
HA-210128-019
Laboratory
MSDH Lab
2.25 ug/l , sample collected Jan 27, 2021 08:52, sampling point SM3 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2021 – Mar 31, 2021
Collected
Oct 21, 2020 09:31
Sampling point
SM6 TCR Site 22 at Hamil's Restaurant
Sample type
Routine
Lab sample
201022-011HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Oct 21, 2020 09:31, sampling point SM6 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.004 mg/l , sample collected Oct 21, 2020 09:31, sampling point SM6 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.009 mg/l , sample collected Oct 21, 2020 09:31, sampling point SM6 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 21, 2020 09:31, sampling point SM6 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 21, 2020 09:31, sampling point SM6 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.013 mg/l , sample collected Oct 21, 2020 09:31, sampling point SM6 Total Haloacetic Acids (Haa5) 2456 Oct 1, 2020 – Dec 31, 2020

Routine (10).