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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

MS0490009 , Stewart Water Association

24 of the 57 analytes this system has been tested for have been detected at least once, across 128 samples on record.

The other 33 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 128 samples on record, detections range from October 8, 2003 to February 25, 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 Stewart 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
Copper, Free 1022 Inorganic Chemical 36 of 36 results Sep 22, 2004 Sep 20, 2023
Lead 1030 Inorganic Chemical 23 of 36 results Sep 22, 2004 Jul 21, 2020
Barium 1010 Inorganic Chemical 10 of 10 results Oct 8, 2003 Jan 10, 2024
Fluoride 1025 Inorganic Chemical 8 of 10 results Oct 8, 2003 Jan 10, 2024
Chromium 1020 Inorganic Chemical 7 of 10 results Oct 8, 2003 Jan 10, 2024
Gross Alpha, Incl. Radon & U 4002 Radionuclide 7 of 7 results Dec 12, 2011 Sep 10, 2019
TTHM 2950 Organic Chemical 6 of 7 results Aug 27, 2007 Feb 25, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 5 of 7 results Jun 16, 2010 Feb 25, 2025
Dichloroacetic Acid 2451 Organic Chemical 4 of 4 results Aug 27, 2007 Jul 5, 2016
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 24, 2019 Feb 25, 2025
Chloroform 2941 Organic Chemical 3 of 4 results Aug 27, 2007 Jul 5, 2016
Bromodichloromethane 2943 Organic Chemical 3 of 4 results Aug 27, 2007 Jul 5, 2016
Combined Radium (-226 & -228) 4010 Radionuclide 2 of 7 results Jun 25, 2018 Sep 10, 2019
Radium-226 4020 Radionuclide 2 of 7 results Jun 25, 2018 Sep 10, 2019
Dibromoacetic Acid 2454 Organic Chemical 2 of 4 results Aug 12, 2013 Jul 5, 2016
Dibromochloromethane 2944 Organic Chemical 2 of 4 results Aug 12, 2013 Jul 5, 2016
Xylenes, Total 2955 Organic Chemical 2 of 19 results Aug 9, 2010 Aug 22, 2011
Arsenic 1005 Inorganic Chemical 1 of 10 results Apr 28, 2020 Apr 28, 2020
Radium-228 4030 Radionuclide 1 of 7 results Sep 10, 2019 Sep 10, 2019
Trichloroacetic Acid 2452 Organic Chemical 1 of 4 results Jul 5, 2016 Jul 5, 2016
Nickel 1036 Inorganic Chemical 1 of 10 results Mar 31, 2014 Mar 31, 2014
Bromoform 2942 Organic Chemical 1 of 4 results Aug 12, 2013 Aug 12, 2013
Cyanide 1024 Inorganic Chemical 1 of 9 results May 2, 2011 May 2, 2011
Selenium 1045 Inorganic Chemical 1 of 10 results Mar 9, 2004 Mar 9, 2004

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 1–10 of 128 samples, newest first — collected September 20, 2023 to March 24, 2025. The summary above covers all 128.

27 results from the 10 samples listed here: 9 detected, 18 not detected. Across the whole record it is 132 of 750. 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 3 sampling points 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 Stewart Water Association, every result from 1 to 10 of 128 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
Mar 24, 2025 12:40
Sampling point
TF103
Sample type
Routine
Lab sample
NI-250325-014
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 24, 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 Mar 24, 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 Mar 24, 2025 12:40, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Feb 25, 2025 13:15
Sampling point
TF103
Sample type
Routine
Lab sample
NA-250226-041
Laboratory
MSDH Lab
69.7 mg/l , sample collected Feb 25, 2025 13:15, sampling point TF103 Sodium 1052 EPA method 200.7 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 14:10
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-250226-002
Laboratory
MSDH Lab
21.4 ug/l , sample collected Feb 25, 2025 14:10, sampling point SMD TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 25, 2025 14:15
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-250226-002
Laboratory
MSDH Lab
6.32 ug/l , sample collected Feb 25, 2025 14:15, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Dec 31, 2025
Collected
Apr 4, 2024 08:00
Sampling point
TF103
Sample type
Routine
Lab sample
NI-240404-069
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 4, 2024 08:00, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 4, 2024 08:00, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 4, 2024 08:00, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Jan 10, 2024 12:08
Sampling point
TF103
Sample type
Routine
Lab sample
RU-240111-039
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:08, sampling point TF103 Combined Uranium 4006 EPA method 200.8 Jan 1, 2022 – Dec 31, 2030
Collected
Jan 10, 2024 12:05
Sampling point
TF103
Sample type
Routine
Lab sample
IN-240111-001
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.0039 mg/l , sample collected Jan 10, 2024 12:05, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.0016 mg/l , sample collected Jan 10, 2024 12:05, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.133 mg/l , sample collected Jan 10, 2024 12:05, sampling point TF103 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 10, 2024 12:05, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Sep 20, 2023 05:00
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-230921-005
Laboratory
MSDH Lab
0.336 mg/l , sample collected Sep 20, 2023 05:00, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 20, 2023 05:00, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 20, 2023 05:35
Sampling point
LC0004 Location withheld
Sample type
Routine
Lab sample
PB-230921-004
Laboratory
MSDH Lab
0.0753 mg/l , sample collected Sep 20, 2023 05:35, sampling point LC0004 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 20, 2023 05:35, sampling point LC0004 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 20, 2023 06:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230921-002
Laboratory
MSDH Lab
0.0205 mg/l , sample collected Sep 20, 2023 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 20, 2023 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).