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.
Analytes tested for
MS0450010 , City of Madison
City of Madison has been analysed for 79 analytes.
This is what has been looked for, not what has been found. Which of them have been detected, and when, is on the sample results page.
The agency also publishes one analyte list across every system it serves. That list carries no results and no counts, and it leaves out coliform and the other microbiological analytes — which this page does not.
77 of these are chemical, radiological or water-quality analytes, and their results are on the chemical and radiological samples page — which counts 77, not 79, for that reason. The other 2 — Coliform (TCR) and E. Coli — are organisms, and their records live with the coliform and microbial samples.
| Analyte | Kind | Results on record | Last collected |
|---|---|---|---|
| 1,1,1-Trichloroethane 2981 | Organic Chemical | 72 | Mar 17, 2025 |
| 1,1,2-Trichloroethane 2985 | Organic Chemical | 72 | Mar 17, 2025 |
| 1,1-Dichloroethylene 2977 | Organic Chemical | 72 | Mar 17, 2025 |
| 1,2,4-Trichlorobenzene 2378 | Organic Chemical | 72 | Mar 17, 2025 |
| 1,2-Dichloroethane 2980 | Organic Chemical | 72 | Mar 17, 2025 |
| 1,2-Dichloropropane 2983 | Organic Chemical | 72 | Mar 17, 2025 |
| Alkalinity, Caco3 Stability 1067 | Water Quality | 1 | May 16, 2007 |
| Alkalinity, Total 1927 | Water Quality | 5 | Mar 2, 2021 |
| Antimony, Total 1074 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Arsenic 1005 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Barium 1010 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Benzene 2990 | Organic Chemical | 72 | Mar 17, 2025 |
| Beryllium, Total 1075 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Bromodichloromethane 2943 | Organic Chemical | 152 | Feb 11, 2026 |
| Bromoform 2942 | Organic Chemical | 152 | Feb 11, 2026 |
| Cadmium 1015 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Calcium 1016 | Inorganic Chemical | 5 | Mar 2, 2021 |
| Calculated Sodium NACA | Water Quality | 1 | May 16, 2007 |
| Carbon Dioxide 1901 | Water Quality | 1 | May 16, 2007 |
| Carbon Tetrachloride 2982 | Organic Chemical | 72 | Mar 17, 2025 |
| Chloride 1017 | Inorganic Chemical | 5 | Mar 2, 2021 |
| Chlorobenzene 2989 | Organic Chemical | 72 | Mar 17, 2025 |
| Chloroform 2941 | Organic Chemical | 152 | Feb 11, 2026 |
| Chromium 1020 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Cis-1,2-Dichloroethylene 2380 | Organic Chemical | 72 | Mar 17, 2025 |
| Coliform (TCR) 3100 | Organism | 3,897 | Aug 4, 2026 |
| Color 1905 | Water Quality | 4 | Mar 2, 2021 |
| Combined Radium (-226 & -228) 4010 | Radionuclide | 13 | Oct 2, 2019 |
| Combined Uranium 4006 | Radionuclide | 13 | Jan 9, 2024 |
| Conductivity @ 25 C Umhos/CM 1064 | Water Quality | 4 | Mar 2, 2021 |
| Copper, Free 1022 | Inorganic Chemical | 245 | Jun 20, 2024 |
| Cyanide 1024 | Inorganic Chemical | 33 | Sep 10, 2025 |
| Dibromoacetic Acid 2454 | Organic Chemical | 147 | Feb 11, 2026 |
| Dibromochloromethane 2944 | Organic Chemical | 152 | Feb 11, 2026 |
| Dichloroacetic Acid 2451 | Organic Chemical | 147 | Feb 11, 2026 |
| Dichloromethane 2964 | Organic Chemical | 72 | Mar 17, 2025 |
| E. Coli 3014 | Organism | 1,336 | Aug 4, 2026 |
| Ethylbenzene 2992 | Organic Chemical | 72 | Mar 17, 2025 |
| Fluoride 1025 | Inorganic Chemical | 42 | Jul 15, 2026 |
| Gross Alpha Particle Activity 4109 | Radionuclide | 6 | Feb 18, 2009 |
| Gross Alpha, Excl. Radon & U 4000 | Radionuclide | 6 | Feb 18, 2009 |
| Gross Alpha, Incl. Radon & U 4002 | Radionuclide | 7 | Oct 2, 2019 |
| Hardness, Total (As Caco3) 1915 | Water Quality | 1 | May 16, 2007 |
| Iron 1028 | Inorganic Chemical | 1 | May 16, 2007 |
| Iron, Field Result FEFD | Inorganic Chemical | 1 | May 16, 2007 |
| Lead 1030 | Inorganic Chemical | 245 | Jun 20, 2024 |
| Magnesium 1031 | Inorganic Chemical | 1 | May 16, 2007 |
| Manganese 1032 | Inorganic Chemical | 1 | May 16, 2007 |
| Mercury 1035 | Inorganic Chemical | 40 | Jul 15, 2026 |
| Monobromoacetic Acid 2453 | Organic Chemical | 147 | Feb 11, 2026 |
| Monochloroacetic Acid 2450 | Organic Chemical | 147 | Feb 11, 2026 |
| Nickel 1036 | Inorganic Chemical | 33 | Mar 11, 2025 |
| Nitrate 1040 | Inorganic Chemical | 77 | Jul 15, 2026 |
| Nitrate-Nitrite 1038 | Inorganic Chemical | 77 | Jul 15, 2026 |
| Nitrite 1041 | Inorganic Chemical | 77 | Jul 15, 2026 |
| O-Dichlorobenzene 2968 | Organic Chemical | 72 | Mar 17, 2025 |
| P-Dichlorobenzene 2969 | Organic Chemical | 72 | Mar 17, 2025 |
| PH 1925 | Water Quality | 1 | May 16, 2007 |
| PH, Field Result PHFD | Water Quality | 1 | May 16, 2007 |
| Potassium 1042 | Inorganic Chemical | 1 | May 16, 2007 |
| Radium-226 4020 | Radionuclide | 13 | Oct 2, 2019 |
| Radium-228 4030 | Radionuclide | 13 | Oct 2, 2019 |
| Residue, Total, Filterable 1057 | Water Quality | 1 | May 16, 2007 |
| Selenium 1045 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Sodium 1052 | Inorganic Chemical | 17 | Feb 24, 2025 |
| Styrene 2996 | Organic Chemical | 72 | Mar 17, 2025 |
| Sulfate 1055 | Inorganic Chemical | 10 | Mar 2, 2021 |
| Temperature, Field Result TEMP | Water Quality | 1 | May 16, 2007 |
| Tetrachloroethylene 2987 | Organic Chemical | 72 | Mar 17, 2025 |
| Thallium, Total 1085 | Inorganic Chemical | 37 | Jul 15, 2026 |
| Toluene 2991 | Organic Chemical | 72 | Mar 17, 2025 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 241 | Feb 11, 2026 |
| Trans-1,2-Dichloroethylene 2979 | Organic Chemical | 72 | Mar 17, 2025 |
| Trichloroacetic Acid 2452 | Organic Chemical | 147 | Feb 11, 2026 |
| Trichloroethylene 2984 | Organic Chemical | 72 | Mar 17, 2025 |
| TTHM 2950 | Organic Chemical | 238 | Feb 11, 2026 |
| Uranium-238 4009 | Radionuclide | 3 | Mar 8, 2006 |
| Vinyl Chloride 2976 | Organic Chemical | 72 | Mar 17, 2025 |
| Xylenes, Total 2955 | Organic Chemical | 72 | Mar 17, 2025 |
A result is one laboratory analysis for one analyte on one sample, whether or not anything was found. Counts cover every Accepted or Validated result on record, with no date range applied.
What an analyte is
“Analytes are contaminants and other elements (some of which are not necessarily contaminants), for which the drinking water is being analyzed.”
From the help text published with these pages.