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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 986 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 986 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 14 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 8 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 14 results Oct 2, 2018 Oct 2, 2018
Radium-228 4030 Radionuclide 2 of 14 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 981–986 of 986 samples, newest first — collected July 31, 2002 to October 13, 2003. The summary above covers all 986.

59 results from the 6 samples listed here: 13 detected, 46 not detected. 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 City of Madison, every result from 981 to 986 of 986 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
Oct 13, 2003
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
031014-002IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Arsenic 1005 EPA method 200.8 Not recorded
0.005 mg/l , sample collected Oct 13, 2003, sampling point TF104 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Cadmium 1015 EPA method 200.8 Not recorded
0.004 mg/l , sample collected Oct 13, 2003, sampling point TF104 Chromium 1020 EPA method 200.8 Not recorded
1.62 mg/l , sample collected Oct 13, 2003, sampling point TF104 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Selenium 1045 EPA method 200.8 Not recorded
7.45 mg/l , sample collected Oct 13, 2003, sampling point TF104 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 13, 2003, sampling point TF104 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Oct 6, 2003
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
031007-104CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Oct 6, 2003
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
031007-103CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Oct 6, 2003
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
031007-042IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Arsenic 1005 EPA method 200.8 Not recorded
0.003 mg/l , sample collected Oct 6, 2003, sampling point TF103 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Cadmium 1015 EPA method 200.8 Not recorded
0.002 mg/l , sample collected Oct 6, 2003, sampling point TF103 Chromium 1020 EPA method 200.8 Not recorded
1.41 mg/l , sample collected Oct 6, 2003, sampling point TF103 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Mercury 1035 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Oct 6, 2003, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Selenium 1045 EPA method 200.8 Not recorded
6.21 mg/l , sample collected Oct 6, 2003, sampling point TF103 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Oct 6, 2003
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
031007-041IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Arsenic 1005 EPA method 200.8 Not recorded
0.035 mg/l , sample collected Oct 6, 2003, sampling point TF080 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Cadmium 1015 EPA method 200.8 Not recorded
0.002 mg/l , sample collected Oct 6, 2003, sampling point TF080 Chromium 1020 EPA method 200.8 Not recorded
1.18 mg/l , sample collected Oct 6, 2003, sampling point TF080 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Selenium 1045 EPA method 200.8 Not recorded
49.8 mg/l , sample collected Oct 6, 2003, sampling point TF080 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 6, 2003, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Jul 31, 2002
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
020801-005VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,2,4-Trichlorobenzene 2378 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Cis-1,2-Dichloroethylene 2380 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Xylenes, Total 2955 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Dichloromethane 2964 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 O-Dichlorobenzene 2968 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 P-Dichlorobenzene 2969 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Vinyl Chloride 2976 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,1-Dichloroethylene 2977 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Trans-1,2-Dichloroethylene 2979 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,2-Dichloroethane 2980 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,1,1-Trichloroethane 2981 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Carbon Tetrachloride 2982 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,2-Dichloropropane 2983 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Trichloroethylene 2984 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 1,1,2-Trichloroethane 2985 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Tetrachloroethylene 2987 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Chlorobenzene 2989 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Benzene 2990 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Toluene 2991 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Ethylbenzene 2992 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 31, 2002, sampling point TF104 Styrene 2996 Not recorded

Routine (6).