Chemical and radiological sample results

MS0450010 ·, City of Madison

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.

Scroll the table sideways for the dates.

The most recent samples, result by result

The table below lists 1–10 of 67 samples, newest first — collected October 8, 2025 to July 15, 2026. The summary above covers all 67.

89 results from the 10 samples listed here: 38 detected, 51 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.

We withheld the location of 2 sampling points 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 The location on record identifies a private home, and we do not publish those.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.

• Collected

  Jul 15, 2026

  Sampling point

  TF105 Treatment Facility TF105

  Sample type

  Routine

  Lab sample

  35051214004

  Laboratory

  Pace Analytical Services, LLC

  Monitoring period

  Jan 1, 2026 – Dec 31, 2031

  • Arsenic 1005 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Barium 1010 EPA method 200.8

    Result

    2.1 ug/l

  • Cadmium 1015 EPA method 200.8

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Chromium 1020 EPA method 200.8

    Result

    Not detected below 2 ug/l Minimum Reporting Level

  • Fluoride 1025 EPA method 300.0

    Result

    0.14 mg/l

  • Mercury 1035 EPA method 245.1

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Selenium 1045 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Antimony, Total 1074 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Beryllium, Total 1075 EPA method 200.8

    Result

    Not detected below 0.1 ug/l Minimum Reporting Level

  • Thallium, Total 1085 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

• Collected

  Jul 15, 2026

  Sampling point

  TF104 Treatment Plant T104

  Sample type

  Routine

  Lab sample

  35051214003

  Laboratory

  Pace Analytical Services, LLC

  Monitoring period

  Jan 1, 2026 – Dec 31, 2031

  • Arsenic 1005 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Barium 1010 EPA method 200.8

    Result

    3.8 ug/l

  • Cadmium 1015 EPA method 200.8

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Chromium 1020 EPA method 200.8

    Result

    Not detected below 2 ug/l Minimum Reporting Level

  • Fluoride 1025 EPA method 300.0

    Result

    0.16 mg/l

  • Mercury 1035 EPA method 245.1

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Selenium 1045 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Antimony, Total 1074 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Beryllium, Total 1075 EPA method 200.8

    Result

    Not detected below 0.1 ug/l Minimum Reporting Level

  • Thallium, Total 1085 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

• Collected

  Jul 15, 2026

  Sampling point

  TF103 Treatment Plant T103

  Sample type

  Routine

  Lab sample

  35051214002

  Laboratory

  Pace Analytical Services, LLC

  Monitoring period

  Jan 1, 2026 – Dec 31, 2031

  • Arsenic 1005 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Barium 1010 EPA method 200.8

    Result

    18.5 ug/l

  • Cadmium 1015 EPA method 200.8

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Chromium 1020 EPA method 200.8

    Result

    Not detected below 2 ug/l Minimum Reporting Level

  • Fluoride 1025 EPA method 300.0

    Result

    0.14 mg/l

  • Mercury 1035 EPA method 245.1

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

  • Selenium 1045 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Antimony, Total 1074 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

  • Beryllium, Total 1075 EPA method 200.8

    Result

    Not detected below 0.1 ug/l Minimum Reporting Level

  • Thallium, Total 1085 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

• Collected

  Jul 15, 2026

  Sampling point

  TF080 Treatment Plant T080

  Sample type

  Routine

  Lab sample

  35051214001

  Laboratory

  Pace Analytical Services, LLC

  • Arsenic 1005 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Barium 1010 EPA method 200.8

    Result

    34.8 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Cadmium 1015 EPA method 200.8

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Chromium 1020 EPA method 200.8

    Result

    Not detected below 2 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Fluoride 1025 EPA method 300.0

    Result

    0.11 mg/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Mercury 1035 EPA method 245.1

    Result

    Not detected below 0.2 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Nitrate-Nitrite 1038

    Result

    0.059 mg/l

    Monitoring period

    Not recorded

  • Nitrate 1040 EPA method 353.2

    Result

    0.059 mg/l

    Monitoring period

    Not recorded

  • Nitrite 1041 EPA method 353.2

    Result

    Not detected below 0.05 mg/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Selenium 1045 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Antimony, Total 1074 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Beryllium, Total 1075 EPA method 200.8

    Result

    Not detected below 0.1 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

  • Thallium, Total 1085 EPA method 200.8

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Jan 1, 2026 – Dec 31, 2031

• Collected

  Feb 11, 2026 12:00

  Sampling point

  SM5 Location withheld

  Sample type

  Routine

  Lab sample

  810-180726-4

  Laboratory

  Eurofins Eaton Analytical South Bend in

  • Monochloroacetic Acid 2450 EPA method 552.2

    Result

    Not detected below 2 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dichloroacetic Acid 2451 EPA method 552.2

    Result

    16 ug/l

    Monitoring period

    Not recorded

  • Trichloroacetic Acid 2452 EPA method 552.2

    Result

    22 ug/l

    Monitoring period

    Not recorded

  • Monobromoacetic Acid 2453 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dibromoacetic Acid 2454 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    38 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

  • Chloroform 2941 EPA method 524.2

    Result

    30 ug/l

    Monitoring period

    Not recorded

  • Bromoform 2942 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Bromodichloromethane 2943 EPA method 524.2

    Result

    4.2 ug/l

    Monitoring period

    Not recorded

  • Dibromochloromethane 2944 EPA method 524.2

    Result

    0.53 ug/l

    Monitoring period

    Not recorded

  • TTHM 2950 EPA method 524.2

    Result

    34.73 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

• Collected

  Feb 11, 2026 13:25

  Sampling point

  SM4 TCR Site 6 at Fire Sta #2

  Sample type

  Routine

  Lab sample

  810-180726-3

  Laboratory

  Eurofins Eaton Analytical South Bend in

  • Monochloroacetic Acid 2450 EPA method 552.2

    Result

    Not detected below 2 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dichloroacetic Acid 2451 EPA method 552.2

    Result

    19 ug/l

    Monitoring period

    Not recorded

  • Trichloroacetic Acid 2452 EPA method 552.2

    Result

    28 ug/l

    Monitoring period

    Not recorded

  • Monobromoacetic Acid 2453 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dibromoacetic Acid 2454 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    47 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

  • Chloroform 2941 EPA method 524.2

    Result

    42 ug/l

    Monitoring period

    Not recorded

  • Bromoform 2942 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Bromodichloromethane 2943 EPA method 524.2

    Result

    5 ug/l

    Monitoring period

    Not recorded

  • Dibromochloromethane 2944 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • TTHM 2950 EPA method 524.2

    Result

    47 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

• Collected

  Feb 11, 2026 13:00

  Sampling point

  SM3 TCR Site 18 at McHs

  Sample type

  Routine

  Lab sample

  810-180726-2

  Laboratory

  Eurofins Eaton Analytical South Bend in

  • Monochloroacetic Acid 2450 EPA method 552.2

    Result

    Not detected below 2 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dichloroacetic Acid 2451 EPA method 552.2

    Result

    18 ug/l

    Monitoring period

    Not recorded

  • Trichloroacetic Acid 2452 EPA method 552.2

    Result

    28 ug/l

    Monitoring period

    Not recorded

  • Monobromoacetic Acid 2453 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dibromoacetic Acid 2454 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    46 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

  • Chloroform 2941 EPA method 524.2

    Result

    39 ug/l

    Monitoring period

    Not recorded

  • Bromoform 2942 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Bromodichloromethane 2943 EPA method 524.2

    Result

    4.7 ug/l

    Monitoring period

    Not recorded

  • Dibromochloromethane 2944 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • TTHM 2950 EPA method 524.2

    Result

    43.7 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

• Collected

  Feb 11, 2026 12:45

  Sampling point

  SM2 Location withheld

  Sample type

  Routine

  Lab sample

  810-180726-1

  Laboratory

  Eurofins Eaton Analytical South Bend in

  • Monochloroacetic Acid 2450 EPA method 552.2

    Result

    Not detected below 2 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dichloroacetic Acid 2451 EPA method 552.2

    Result

    12 ug/l

    Monitoring period

    Not recorded

  • Trichloroacetic Acid 2452 EPA method 552.2

    Result

    18 ug/l

    Monitoring period

    Not recorded

  • Monobromoacetic Acid 2453 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Dibromoacetic Acid 2454 EPA method 552.2

    Result

    Not detected below 1 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    30 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

  • Chloroform 2941 EPA method 524.2

    Result

    27 ug/l

    Monitoring period

    Not recorded

  • Bromoform 2942 EPA method 524.2

    Result

    Not detected below 0.5 ug/l Minimum Reporting Level

    Monitoring period

    Not recorded

  • Bromodichloromethane 2943 EPA method 524.2

    Result

    4.5 ug/l

    Monitoring period

    Not recorded

  • Dibromochloromethane 2944 EPA method 524.2

    Result

    0.75 ug/l

    Monitoring period

    Not recorded

  • TTHM 2950 EPA method 524.2

    Result

    32.25 ug/l

    Monitoring period

    Jan 1, 2026 – Dec 31, 2026

• Collected

  Oct 8, 2025 12:55

  Sampling point

  SM6 TCR Site 22 at Hamil's Restaurant

  Sample type

  Routine

  Lab sample

  HA-251009-010

  Laboratory

  MSDH Lab

  Monitoring period

  Oct 1, 2025 – Dec 31, 2025

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    18.9 ug/l

• Collected

  Oct 8, 2025 13:10

  Sampling point

  SM5 Location withheld

  Sample type

  Routine

  Lab sample

  HA-251009-009

  Laboratory

  MSDH Lab

  Monitoring period

  Oct 1, 2025 – Dec 31, 2025

  • Total Haloacetic Acids (Haa5) 2456 EPA method 552.2

    Result

    42.4 ug/l

Routine (10).