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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.

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

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 131–140 of 149 samples, newest first — collected August 18, 1993 to February 24, 1994. The summary above covers all 149.

20 results from the 10 samples listed here: 15 detected, 5 not detected. Across the whole record it is 188 of 580. 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 Knollwood, every result from 131 to 140 of 149 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
Feb 24, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940225-071L
Laboratory
MSDH Lab
0.073 mg/l , sample collected Feb 24, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 24, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-136L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.007 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-135L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.006 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-134L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.002 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-132L
Laboratory
MSDH Lab
0.155 mg/l , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-131L
Laboratory
MSDH Lab
0.148 mg/l , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-130L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-113L
Laboratory
MSDH Lab
0.127 mg/l , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 23, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940224-112L
Laboratory
MSDH Lab
0.057 mg/l , sample collected Feb 23, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 23, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 18, 1993
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
930819-071L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Aug 18, 1993, sampling point DS000 Copper, Free 1022 Not recorded
0.006 mg/l , sample collected Aug 18, 1993, sampling point DS000 Lead 1030 Not recorded

Routine (10).