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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 51–60 of 149 samples, newest first — collected February 1, 2012 to July 7, 2014. The summary above covers all 149.

47 results from the 10 samples listed here: 15 detected, 32 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 51 to 60 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
Jul 7, 2014 03:14
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140711-045PB
Laboratory
MSDH Lab
0.3082 mg/l , sample collected Jul 7, 2014 03:14, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 7, 2014 03:14, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Jul 7, 2014 18:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140711-044PB
Laboratory
MSDH Lab
0.0313 mg/l , sample collected Jul 7, 2014 18:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0012 mg/l , sample collected Jul 7, 2014 18:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Feb 10, 2014 14:47
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
140211-098NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 10, 2014 14:47, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 10, 2014 14:47, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 10, 2014 14:47, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Collected
Jun 25, 2013 03:09
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
130626-011VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 25, 2013 03:09, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Collected
Jan 30, 2013 02:35
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
130131-074NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 30, 2013 02:35, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 30, 2013 02:35, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 30, 2013 02:35, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Sep 18, 2012 14:52
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
201212280261
Laboratory
Radiation Safety Engineering
0.5 pci/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected Sep 18, 2012 14:52, sampling point TF101 Gross Alpha Particle Activity 4109 EPA method 00-02 Not recorded
Collected
Jul 19, 2012 02:44
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120720-002TH
Laboratory
MSDH Lab
21.2 ug/l , sample collected Jul 19, 2012 02:44, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 19, 2012 02:44, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
8.08 ug/l , sample collected Jul 19, 2012 02:44, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
2.59 ug/l , sample collected Jul 19, 2012 02:44, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
31.9 ug/l , sample collected Jul 19, 2012 02:44, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2011 – Dec 31, 2013
Collected
Jul 19, 2012 02:38
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120720-002HA
Laboratory
MSDH Lab
0.004 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.016 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.018 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.042 mg/l , sample collected Jul 19, 2012 02:38, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2011 – Dec 31, 2013
Collected
Jun 28, 2012 14:24
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
201208200044
Laboratory
Radiation Safety Engineering
1.1 pci/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected Jun 28, 2012 14:24, sampling point TF101 Gross Alpha Particle Activity 4109 EPA method 00-02 Not recorded
Collected
Feb 1, 2012 03:24
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120202-033NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 1, 2012 03:24, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 1, 2012 03:24, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 1, 2012 03:24, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012

Routine (10).