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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

MS0090005 , City of Houston

20 of the 58 analytes this system has been tested for have been detected at least once, across 540 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 540 samples on record, detections range from July 3, 1992 to July 30, 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 City of Houston, 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 277 of 324 results Jul 3, 1992 Jun 27, 2024
Lead 1030 Inorganic Chemical 252 of 324 results Jul 3, 1992 Jun 27, 2024
Barium 1010 Inorganic Chemical 33 of 33 results Jul 16, 2002 Jan 27, 2025
Fluoride 1025 Inorganic Chemical 33 of 33 results Jul 16, 2002 Jan 27, 2025
Chromium 1020 Inorganic Chemical 17 of 33 results Jul 16, 2002 Apr 8, 2020
Selenium 1045 Inorganic Chemical 17 of 33 results Jul 16, 2002 Apr 8, 2020
Arsenic 1005 Inorganic Chemical 16 of 33 results Feb 16, 2005 Jan 27, 2025
TTHM 2950 Organic Chemical 15 of 22 results Jul 12, 2007 Jul 30, 2025
Bromoform 2942 Organic Chemical 9 of 17 results May 13, 2019 Jul 30, 2025
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 24, 2019 Oct 14, 2024
Nickel 1036 Inorganic Chemical 9 of 33 results Jan 12, 2004 Apr 8, 2020
Nitrite 1041 Inorganic Chemical 8 of 66 results Apr 11, 2007 Jan 10, 2022
Dibromochloromethane 2944 Organic Chemical 4 of 17 results May 13, 2019 Jul 30, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 4 of 66 results Apr 11, 2007 May 7, 2008
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 3 of 20 results Jul 12, 2007 Aug 20, 2014
Thallium, Total 1085 Inorganic Chemical 2 of 33 results Apr 8, 2020 Apr 8, 2020
Dibromoacetic Acid 2454 Organic Chemical 1 of 14 results Dec 20, 2023 Dec 20, 2023
Monobromoacetic Acid 2453 Organic Chemical 1 of 14 results Aug 20, 2014 Aug 20, 2014
Nitrate 1040 Inorganic Chemical 1 of 66 results Jun 7, 2006 Jun 7, 2006
Cadmium 1015 Inorganic Chemical 1 of 33 results Feb 16, 2005 Feb 16, 2005

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 181–190 of 540 samples, newest first — collected August 8, 2012 to April 23, 2014. The summary above covers all 540.

43 results from the 10 samples listed here: 13 detected, 30 not detected. Across the whole record it is 712 of 1,935. 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 City of Houston, every result from 181 to 190 of 540 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
Apr 23, 2014 02:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
140424-007IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:00, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0398 mg/l , sample collected Apr 23, 2014 02:00, 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 Apr 23, 2014 02:00, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0016 mg/l , sample collected Apr 23, 2014 02:00, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.266 mg/l , sample collected Apr 23, 2014 02:00, 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 Apr 23, 2014 02:00, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0007 mg/l , sample collected Apr 23, 2014 02:00, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:00, 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 Apr 23, 2014 02:00, 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 Apr 23, 2014 02:00, 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 Apr 23, 2014 02:00, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Apr 23, 2014 02:30
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
140424-006IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:30, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0415 mg/l , sample collected Apr 23, 2014 02:30, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:30, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0018 mg/l , sample collected Apr 23, 2014 02:30, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.303 mg/l , sample collected Apr 23, 2014 02:30, sampling point TF103 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:30, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0007 mg/l , sample collected Apr 23, 2014 02:30, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:30, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2014 02:30, sampling point TF103 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 Apr 23, 2014 02:30, sampling point TF103 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 Apr 23, 2014 02:30, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Jan 21, 2014 02:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
140122-042NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 21, 2014 02:30, 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 Jan 21, 2014 02:30, 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 Jan 21, 2014 02:30, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Collected
Jan 21, 2014 02:18
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
140122-036NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 21, 2014 02:18, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 21, 2014 02:18, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 21, 2014 02:18, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Collected
Jan 16, 2013 01:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
130117-067NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 16, 2013 01:30, 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 16, 2013 01:30, 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 16, 2013 01:30, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Jan 16, 2013 03:15
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
130117-053NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 16, 2013 03:15, sampling point TF103 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 16, 2013 03:15, sampling point TF103 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 16, 2013 03:15, sampling point TF103 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Jan 16, 2013 02:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
130117-052NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 16, 2013 02:00, sampling point TF102 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 16, 2013 02:00, sampling point TF102 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 16, 2013 02:00, sampling point TF102 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Aug 8, 2012 13:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120810-020PB
Laboratory
MSDH Lab
0.157 mg/l , sample collected Aug 8, 2012 13:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.003 mg/l , sample collected Aug 8, 2012 13:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Aug 8, 2012 13:15
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120810-019PB
Laboratory
MSDH Lab
0.0426 mg/l , sample collected Aug 8, 2012 13:15, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 8, 2012 13:15, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Aug 8, 2012 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120810-018PB
Laboratory
MSDH Lab
0.0432 mg/l , sample collected Aug 8, 2012 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.001 mg/l , sample collected Aug 8, 2012 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013

Routine (10).