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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

MS0240027 , Knollwood

23 of the 59 analytes this system has been tested for have been detected at least once, across 149 samples on record.

The other 36 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 149 samples on record, detections range from August 17, 1993 to February 11, 2025. These figures cover the whole record; the list of samples further down is narrowed.

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 Knollwood, 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 53 of 70 results Aug 17, 1993 Jun 30, 2023
Lead 1030 Inorganic Chemical 43 of 70 results Aug 17, 1993 Jun 29, 2023
Barium 1010 Inorganic Chemical 10 of 10 results Sep 15, 2003 Feb 11, 2025
Fluoride 1025 Inorganic Chemical 10 of 10 results Sep 15, 2003 Feb 11, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 10 of 10 results May 24, 2004 Feb 11, 2025
TTHM 2950 Organic Chemical 10 of 10 results May 24, 2004 Feb 11, 2025
Chromium 1020 Inorganic Chemical 6 of 10 results Sep 15, 2003 Apr 26, 2022
Chloroform 2941 Organic Chemical 6 of 6 results Sep 19, 2006 Jul 30, 2018
Bromodichloromethane 2943 Organic Chemical 6 of 6 results Sep 19, 2006 Jul 30, 2018
Dibromochloromethane 2944 Organic Chemical 6 of 6 results Sep 19, 2006 Jul 30, 2018
Dichloroacetic Acid 2451 Organic Chemical 4 of 4 results Sep 18, 2008 Jul 30, 2018
Trichloroacetic Acid 2452 Organic Chemical 4 of 4 results Sep 18, 2008 Jul 30, 2018
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 16, 2019 Feb 13, 2024
Monobromoacetic Acid 2453 Organic Chemical 2 of 4 results Jul 19, 2012 Jul 30, 2018
Dibromoacetic Acid 2454 Organic Chemical 2 of 4 results Jul 19, 2012 Jul 30, 2018
Gross Alpha Particle Activity 4109 Radionuclide 2 of 4 results Jun 28, 2012 Sep 18, 2012
Gross Alpha, Excl. Radon & U 4000 Radionuclide 2 of 2 results Sep 26, 2011 Nov 30, 2011
Combined Uranium 4006 Radionuclide 2 of 3 results Sep 26, 2011 Nov 30, 2011
Nickel 1036 Inorganic Chemical 2 of 10 results Feb 6, 2006 Apr 7, 2008
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 15, 2003 Feb 2, 2004
Monochloroacetic Acid 2450 Organic Chemical 1 of 4 results Jul 19, 2012 Jul 19, 2012
Arsenic 1005 Inorganic Chemical 1 of 10 results Apr 7, 2008 Apr 7, 2008
Selenium 1045 Inorganic Chemical 1 of 10 results Feb 6, 2006 Feb 6, 2006

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The 5 samples collected between September 25, 2024 and September 25, 2026 are listed below, newest first.

17 results from the 5 samples listed here: 4 detected, 13 not detected. 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 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 Knollwood, every result from the 5 samples on record, 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
Aug 25, 2025 10:45
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250826-028
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Aug 25, 2025 10:45, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Feb 11, 2025 11:37
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250212-039
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0139 mg/l , sample collected Feb 11, 2025 11:37, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.385 mg/l , sample collected Feb 11, 2025 11:37, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 11:37, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 11, 2025 09:50
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-250212-008
Laboratory
MSDH Lab
19.3 ug/l , sample collected Feb 11, 2025 09:50, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Feb 11, 2025 09:55
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-250212-008
Laboratory
MSDH Lab
33.2 ug/l , sample collected Feb 11, 2025 09:55, sampling point SMD TTHM 2950 EPA method 524.2 Not recorded
Collected
Feb 11, 2025 15:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-250212-029
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 15:00, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 15:00, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 11, 2025 15:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (5).