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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 41–50 of 149 samples, newest first — collected July 7, 2014 to February 6, 2017. The summary above covers all 149.

38 results from the 10 samples listed here: 16 detected, 22 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 41 to 50 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 6, 2017 13:50
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
170207-036NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 6, 2017 13:50, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 6, 2017 13:50, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 6, 2017 13:50, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Mar 22, 2016 14:48
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
160323-037NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 22, 2016 14:48, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 22, 2016 14:48, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 22, 2016 14:48, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Mar 11, 2015 01:20
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150312-021IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0169 mg/l , sample collected Mar 11, 2015 01:20, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0028 mg/l , sample collected Mar 11, 2015 01:20, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.379 mg/l , sample collected Mar 11, 2015 01:20, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 11, 2015 01:20, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Feb 2, 2015 15:10
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
150203-087NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 2, 2015 15:10, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 2, 2015 15:10, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 2, 2015 15:10, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Collected
Sep 17, 2014 04:03
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
140918-037HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 17, 2014 04:03, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.006 mg/l , sample collected Sep 17, 2014 04:03, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.003 mg/l , sample collected Sep 17, 2014 04:03, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2014 04:03, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2014 04:03, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.009 mg/l , sample collected Sep 17, 2014 04:03, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
Sep 17, 2014 04:02
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
140918-036TH
Laboratory
MSDH Lab
16.8 ug/l , sample collected Sep 17, 2014 04:02, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 17, 2014 04:02, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
5.13 ug/l , sample collected Sep 17, 2014 04:02, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
1.57 ug/l , sample collected Sep 17, 2014 04:02, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
23.5 ug/l , sample collected Sep 17, 2014 04:02, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2016
Collected
Aug 11, 2014 02:48
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
140812-017CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Aug 11, 2014 02:48, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2014 – Dec 31, 2016
Collected
Jul 9, 2014 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140711-043PB
Laboratory
MSDH Lab
0.2558 mg/l , sample collected Jul 9, 2014 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0012 mg/l , sample collected Jul 9, 2014 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Jul 8, 2014 07:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140711-047PB
Laboratory
MSDH Lab
0.0187 mg/l , sample collected Jul 8, 2014 07:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0009 mg/l , sample collected Jul 8, 2014 07:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Jul 7, 2014 09:20
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140711-046PB
Laboratory
MSDH Lab
0.1972 mg/l , sample collected Jul 7, 2014 09:20, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0027 mg/l , sample collected Jul 7, 2014 09:20, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014

Routine (10).