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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 271–280 of 985 samples, newest first — collected March 2, 2021 to April 20, 2021. The summary above covers all 985.

66 results from the 10 samples listed here: 32 detected, 34 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.

Chemical and radiological sample results for City of Madison, every result from 271 to 280 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
Apr 20, 2021 09:51
Sampling point
SM3 TCR Site 18 at McHs
Sample type
Routine
Lab sample
HA-210421-001
Laboratory
MSDH Lab
36.7 ug/l , sample collected Apr 20, 2021 09:51, sampling point SM3 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2021 – Jun 30, 2021
Collected
Mar 30, 2021 09:35
Sampling point
TF105 Treatment Facility TF105
Sample type
Routine
Lab sample
NI-210330-036
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:35, sampling point TF105 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:35, sampling point TF105 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:35, sampling point TF105 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Mar 30, 2021 08:30
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
NI-210330-037
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:30, sampling point TF104 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:30, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:30, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Mar 30, 2021 09:15
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-210330-035
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:15, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:15, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 09:15, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Mar 30, 2021 08:45
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-210330-034
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:45, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:45, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 30, 2021 08:45, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Mar 30, 2021 08:42
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
210331-018VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 30, 2021 08:42, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2016 – Dec 31, 2021
Collected
Mar 2, 2021 08:30
Sampling point
WL004 Well W004
Sample type
Routine
Lab sample
7PC-210309-003
Laboratory
MSDH Lab
0.901 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Calcium 1016 EPA method 200.7 Not recorded
1.59 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Chloride 1017 EPA method 300.0 Not recorded
0.143 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Fluoride 1025 EPA method 300.0 Not recorded
91.6 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Sodium 1052 EPA method 200.7 Not recorded
7.12 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Sulfate 1055 EPA method 300.0 Not recorded
385 umho/cm , sample collected Mar 2, 2021 08:30, sampling point WL004 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
20 cu , sample collected Mar 2, 2021 08:30, sampling point WL004 Color 1905 EPA method 2120B Not recorded
191 mg/l , sample collected Mar 2, 2021 08:30, sampling point WL004 Alkalinity, Total 1927 EPA method 2320B Not recorded
Collected
Mar 2, 2021 09:30
Sampling point
WL003 Well W003
Sample type
Routine
Lab sample
7PC-210309-002
Laboratory
MSDH Lab
0.396 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Calcium 1016 EPA method 200.7 Not recorded
1.94 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Chloride 1017 EPA method 300.0 Not recorded
0.166 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Fluoride 1025 EPA method 300.0 Not recorded
95 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Sodium 1052 EPA method 200.7 Not recorded
6.25 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Sulfate 1055 EPA method 300.0 Not recorded
392 umho/cm , sample collected Mar 2, 2021 09:30, sampling point WL003 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
25 cu , sample collected Mar 2, 2021 09:30, sampling point WL003 Color 1905 EPA method 2120B Not recorded
195 mg/l , sample collected Mar 2, 2021 09:30, sampling point WL003 Alkalinity, Total 1927 EPA method 2320B Not recorded
Collected
Mar 2, 2021 09:50
Sampling point
WL005 Well WL005
Sample type
Routine
Lab sample
7PC-210309-004
Laboratory
MSDH Lab
0.268 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Calcium 1016 EPA method 200.7 Not recorded
2.97 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Chloride 1017 EPA method 300.0 Not recorded
0.141 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Fluoride 1025 EPA method 300.0 Not recorded
85.4 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Sodium 1052 EPA method 200.7 Not recorded
8.6 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Sulfate 1055 EPA method 300.0 Not recorded
335 umho/cm , sample collected Mar 2, 2021 09:50, sampling point WL005 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
10 cu , sample collected Mar 2, 2021 09:50, sampling point WL005 Color 1905 EPA method 2120B Not recorded
162 mg/l , sample collected Mar 2, 2021 09:50, sampling point WL005 Alkalinity, Total 1927 EPA method 2320B Not recorded
Collected
Mar 2, 2021 09:00
Sampling point
WL002 Well W002
Sample type
Routine
Lab sample
7PC-210309-001
Laboratory
MSDH Lab
3.63 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Calcium 1016 EPA method 200.7 Not recorded
17.3 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Chloride 1017 EPA method 300.0 Not recorded
0.0847 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Fluoride 1025 EPA method 300.0 Not recorded
102 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Sodium 1052 EPA method 200.7 Not recorded
46.8 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Sulfate 1055 EPA method 300.0 Not recorded
513 umho/cm , sample collected Mar 2, 2021 09:00, sampling point WL002 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
Not detected below 10 cu Minimum Reporting Level , sample collected Mar 2, 2021 09:00, sampling point WL002 Color 1905 EPA method 2120B Not recorded
180 mg/l , sample collected Mar 2, 2021 09:00, sampling point WL002 Alkalinity, Total 1927 EPA method 2320B Not recorded

Routine (10).