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.
| 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 221–230 of 540 samples, newest first — collected August 22, 2011 to January 23, 2012. The summary above covers all 540.
31 results from the 10 samples listed here: 0 detected, 31 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 23, 2012 13:45, sampling point TF103 | Combined Uranium 4006 EPA method 200.8 | Jan 1, 2012 – Mar 31, 2012 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 23, 2012 14:13, sampling point TF101 | Combined Uranium 4006 EPA method 200.8 | Jan 1, 2012 – Mar 31, 2012 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:00, sampling point TF101 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:00, sampling point TF101 | Nitrate 1040 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:00, sampling point TF101 | Nitrite 1041 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 02:00, sampling point TF102 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 02:00, sampling point TF102 | Nitrate 1040 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 02:00, sampling point TF102 | Nitrite 1041 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:30, sampling point TF103 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:30, sampling point TF103 | Nitrate 1040 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 17, 2012 01:30, sampling point TF103 | Nitrite 1041 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
|
||
| Not detected below 0.6 pci/l Minimum Reporting Level , sample collected Dec 20, 2011 13:00, sampling point TF103 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Dec 20, 2011 13:00, sampling point TF103 | Radium-226 4020 EPA method 903.1 | Oct 1, 2011 – Dec 31, 2011 |
| Not detected below 0.6 pci/l Minimum Reporting Level , sample collected Dec 20, 2011 13:00, sampling point TF103 | Radium-228 4030 EPA method 904 | Oct 1, 2011 – Dec 31, 2011 |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Dec 20, 2011 13:00, sampling point TF103 | Gross Alpha Particle Activity 4109 EPA method 00-02 | Oct 1, 2011 – Dec 31, 2011 |
|
||
| Not detected below 0.7 pci/l Minimum Reporting Level , sample collected Dec 19, 2011 01:30, sampling point TF101 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Dec 19, 2011 01:30, sampling point TF101 | Radium-226 4020 EPA method 903.1 | Oct 1, 2011 – Dec 31, 2011 |
| Not detected below 0.7 pci/l Minimum Reporting Level , sample collected Dec 19, 2011 01:30, sampling point TF101 | Radium-228 4030 EPA method 904 | Oct 1, 2011 – Dec 31, 2011 |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Dec 19, 2011 01:30, sampling point TF101 | Gross Alpha Particle Activity 4109 EPA method 00-02 | Oct 1, 2011 – Dec 31, 2011 |
|
||
| Not detected below 0.6 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 13:10, sampling point TF103 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 13:10, sampling point TF103 | Radium-226 4020 EPA method 903.1 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.6 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 13:10, sampling point TF103 | Radium-228 4030 EPA method 904 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 13:10, sampling point TF103 | Gross Alpha Particle Activity 4109 EPA method 00-02 | Jul 1, 2011 – Sep 30, 2011 |
|
||
| Not detected below 0.9 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:50, sampling point TF102 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:50, sampling point TF102 | Radium-226 4020 EPA method 903.1 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.9 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:50, sampling point TF102 | Radium-228 4030 EPA method 904 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:50, sampling point TF102 | Gross Alpha Particle Activity 4109 EPA method 00-02 | Jul 1, 2011 – Sep 30, 2011 |
|
||
| Not detected below 0.7 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:30, sampling point TF101 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:30, sampling point TF101 | Radium-226 4020 EPA method 903.1 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.7 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:30, sampling point TF101 | Radium-228 4030 EPA method 904 | Jul 1, 2011 – Sep 30, 2011 |
| Not detected below 0.4 pci/l Minimum Reporting Level , sample collected Aug 22, 2011 12:30, sampling point TF101 | Gross Alpha Particle Activity 4109 EPA method 00-02 | Jul 1, 2011 – Sep 30, 2011 |
-
- Collected
- Jan 23, 2012 13:45
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 120124-021RU
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Mar 31, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jan 23, 2012 14:13
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120124-020RU
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Mar 31, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jan 17, 2012 01:00
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120118-104NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Dec 31, 2012
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Jan 17, 2012 02:00
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120118-069NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Dec 31, 2012
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Jan 17, 2012 01:30
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 120118-068NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Dec 31, 2012
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Dec 20, 2011 13:00
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 111220-014
- Laboratory
- Radiation Safety Engineering
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.6 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
Radium-228 4030 EPA method 904
- Result
- Not detected below 0.6 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
Gross Alpha Particle Activity 4109 EPA method 00-02
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
- Collected
- Dec 19, 2011 01:30
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 111220-013
- Laboratory
- Radiation Safety Engineering
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.7 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
Radium-228 4030 EPA method 904
- Result
- Not detected below 0.7 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
Gross Alpha Particle Activity 4109 EPA method 00-02
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Oct 1, 2011 – Dec 31, 2011
-
- Collected
- Aug 22, 2011 13:10
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- 110823-012
- Laboratory
- Radiation Safety Engineering
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.6 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Radium-228 4030 EPA method 904
- Result
- Not detected below 0.6 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Gross Alpha Particle Activity 4109 EPA method 00-02
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
- Collected
- Aug 22, 2011 12:50
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 110823-011
- Laboratory
- Radiation Safety Engineering
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.9 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Radium-228 4030 EPA method 904
- Result
- Not detected below 0.9 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Gross Alpha Particle Activity 4109 EPA method 00-02
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
- Collected
- Aug 22, 2011 12:30
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 110823-013
- Laboratory
- Radiation Safety Engineering
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.7 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Radium-228 4030 EPA method 904
- Result
- Not detected below 0.7 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
-
Gross Alpha Particle Activity 4109 EPA method 00-02
- Result
- Not detected below 0.4 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2011 – Sep 30, 2011
Routine (10).