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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

MS0180014 , Brooklyn Water Association

20 of the 58 analytes this system has been tested for have been detected at least once, across 305 samples on record.

The other 38 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 305 samples on record, detections range from November 23, 1993 to February 3, 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 Brooklyn Water Association, 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
Lead 1030 Inorganic Chemical 106 of 129 results Nov 23, 1993 Jul 11, 2023
Copper, Free 1022 Inorganic Chemical 92 of 129 results Nov 23, 1993 Jul 11, 2023
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 24 of 25 results Aug 2, 2007 Apr 26, 2023
TTHM 2950 Organic Chemical 23 of 24 results May 19, 2004 Apr 26, 2023
Barium 1010 Inorganic Chemical 20 of 20 results Sep 29, 2003 Feb 3, 2025
Fluoride 1025 Inorganic Chemical 19 of 20 results Sep 29, 2003 Feb 3, 2025
Chloroform 2941 Organic Chemical 16 of 17 results Aug 2, 2007 Nov 7, 2017
Bromodichloromethane 2943 Organic Chemical 15 of 17 results Aug 2, 2007 Nov 7, 2017
Dichloroacetic Acid 2451 Organic Chemical 12 of 17 results Feb 26, 2009 Dec 2, 2020
Dibromochloromethane 2944 Organic Chemical 12 of 17 results Aug 2, 2007 Nov 17, 2011
Chromium 1020 Inorganic Chemical 11 of 20 results Sep 29, 2003 Feb 3, 2025
Trichloroacetic Acid 2452 Organic Chemical 10 of 17 results Feb 26, 2009 Dec 2, 2020
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Mar 7, 2012 Oct 24, 2012
Sodium 1052 Inorganic Chemical 6 of 6 results Oct 6, 2019 Jan 29, 2024
Nickel 1036 Inorganic Chemical 4 of 20 results Apr 9, 2008 Feb 3, 2025
Sulfate 1055 Inorganic Chemical 4 of 4 results Sep 29, 2003 Feb 4, 2004
Cadmium 1015 Inorganic Chemical 2 of 20 results Mar 9, 2005 Mar 9, 2005
Selenium 1045 Inorganic Chemical 2 of 20 results Mar 9, 2005 Mar 9, 2005
Monochloroacetic Acid 2450 Organic Chemical 1 of 17 results Sep 30, 2009 Sep 30, 2009
Dibromoacetic Acid 2454 Organic Chemical 1 of 17 results Sep 30, 2009 Sep 30, 2009

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

30 results from the 6 samples listed here: 8 detected, 22 not detected. 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 Brooklyn Water Association, every result from the 6 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
Jun 10, 2025 14:10
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
CN-250611-016
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 10, 2025 14:10, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Jun 10, 2025 14:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-250611-017
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 10, 2025 14:00, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Feb 3, 2025 12:54
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
IN-250204-037
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:54, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0032 mg/l , sample collected Feb 3, 2025 12:54, sampling point TF103 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 3, 2025 12:54, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0009 mg/l , sample collected Feb 3, 2025 12:54, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.263 mg/l , sample collected Feb 3, 2025 12:54, sampling point TF103 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 3, 2025 12:54, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0065 mg/l , sample collected Feb 3, 2025 12:54, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:54, sampling point TF103 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 3, 2025 12:54, sampling point TF103 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 3, 2025 12:54, sampling point TF103 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 3, 2025 12:54, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 3, 2025 12:47
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-250204-036
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:47, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0033 mg/l , sample collected Feb 3, 2025 12:47, sampling point TF102 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 3, 2025 12:47, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0015 mg/l , sample collected Feb 3, 2025 12:47, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.263 mg/l , sample collected Feb 3, 2025 12:47, sampling point TF102 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 3, 2025 12:47, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0005 mg/l , sample collected Feb 3, 2025 12:47, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:47, sampling point TF102 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 3, 2025 12:47, sampling point TF102 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 3, 2025 12:47, sampling point TF102 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 3, 2025 12:47, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 3, 2025 12:40
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-250204-082
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:40, sampling point TF103 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 3, 2025 12:40, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:40, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Feb 3, 2025 12:44
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250204-081
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:44, sampling point TF102 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 3, 2025 12:44, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 3, 2025 12:44, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (6).