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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 281–290 of 540 samples, newest first — collected August 22, 2007 to March 24, 2008. The summary above covers all 540.

29 results from the 10 samples listed here: 22 detected, 7 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 281 to 290 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
Mar 24, 2008
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
080325-088IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.035654 mg/l , sample collected Mar 24, 2008, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.276 mg/l , sample collected Mar 24, 2008, sampling point TF103 Fluoride 1025 EPA method 380-75WE Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.004164 mg/l , sample collected Mar 24, 2008, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
0.000918 mg/l , sample collected Mar 24, 2008, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Collected
Aug 23, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-344PB
Laboratory
MSDH Lab
0.073 mg/l , sample collected Aug 23, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0009 mg/l , sample collected Aug 23, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 23, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-339PB
Laboratory
MSDH Lab
0.0805 mg/l , sample collected Aug 23, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0016 mg/l , sample collected Aug 23, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-347PB
Laboratory
MSDH Lab
0.1712 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0009 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-346PB
Laboratory
MSDH Lab
0.0431 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.001 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-345PB
Laboratory
MSDH Lab
0.2608 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0027 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-343PB
Laboratory
MSDH Lab
0.096 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0011 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-342PB
Laboratory
MSDH Lab
0.0298 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0007 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-340PB
Laboratory
MSDH Lab
0.0597 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0011 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Aug 22, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070824-338PB
Laboratory
MSDH Lab
0.1597 mg/l , sample collected Aug 22, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.0017 mg/l , sample collected Aug 22, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007

Routine (10).