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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; 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 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

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

Choose a date range

The most recent samples, result by result

The table below lists 1–10 of 13 samples, newest first — collected January 27, 2025 to July 30, 2025. The summary above covers all 13.

56 results from the 10 samples listed here: 12 detected, 44 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.

We withheld the location of 1 sampling point 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 City of Houston, every result from 1 to 10 of 13 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 30, 2025 11:15
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-157879-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
0.94 ug/l , sample collected Jul 30, 2025 11:15, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:15, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
0.59 ug/l , sample collected Jul 30, 2025 11:15, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
1.53 ug/l , sample collected Jul 30, 2025 11:15, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
May 20, 2025 10:35
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
CN-250521-010
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 20, 2025 10:35, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
May 20, 2025 11:05
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-250521-011
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 20, 2025 11:05, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
May 20, 2025 10:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250521-009
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 20, 2025 10:00, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Jan 27, 2025 08:00
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
IN-250128-003
Laboratory
MSDH Lab
0.0019 mg/l , sample collected Jan 27, 2025 08:00, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0399 mg/l , sample collected Jan 27, 2025 08:00, 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 Jan 27, 2025 08:00, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:00, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.294 mg/l , sample collected Jan 27, 2025 08:00, 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 Jan 27, 2025 08:00, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:00, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:00, 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 Jan 27, 2025 08:00, 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 Jan 27, 2025 08:00, 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 Jan 27, 2025 08:00, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 27, 2025 08:40
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-250128-002
Laboratory
MSDH Lab
0.0018 mg/l , sample collected Jan 27, 2025 08:40, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0528 mg/l , sample collected Jan 27, 2025 08:40, 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 Jan 27, 2025 08:40, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:40, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.273 mg/l , sample collected Jan 27, 2025 08:40, 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 Jan 27, 2025 08:40, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:40, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:40, 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 Jan 27, 2025 08:40, 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 Jan 27, 2025 08:40, 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 Jan 27, 2025 08:40, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 27, 2025 08:20
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250128-001
Laboratory
MSDH Lab
0.0018 mg/l , sample collected Jan 27, 2025 08:20, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0402 mg/l , sample collected Jan 27, 2025 08:20, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:20, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:20, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.294 mg/l , sample collected Jan 27, 2025 08:20, sampling point TF101 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 Jan 27, 2025 08:20, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:20, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:20, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:20, sampling point TF101 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 Jan 27, 2025 08:20, sampling point TF101 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 Jan 27, 2025 08:20, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 27, 2025 07:45
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-250128-028
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 07:45, 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 Jan 27, 2025 07:45, 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 Jan 27, 2025 07:45, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Jan 27, 2025 07:10
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250128-027
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 07:10, 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 Jan 27, 2025 07:10, 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 Jan 27, 2025 07:10, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Jan 27, 2025 08:05
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-250128-026
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:05, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:05, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 27, 2025 08:05, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (10).