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
MS0450024 , PRVWSD-Twin Harbor
28 of the 56 analytes this system has been tested for have been detected at least once, across 310 samples on record.
The other 28 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 310 samples on record, detections range from October 6, 2003 to November 20, 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 | 135 of 135 results | Jun 29, 2004 | Aug 20, 2024 |
| Lead 1030 | Inorganic Chemical | 67 of 135 results | Jun 29, 2004 | Aug 20, 2024 |
| TTHM 2950 | Organic Chemical | 21 of 21 results | Jul 12, 2004 | Nov 20, 2025 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 20 of 21 results | Aug 22, 2007 | Nov 20, 2025 |
| Barium 1010 | Inorganic Chemical | 17 of 17 results | Oct 6, 2003 | Mar 11, 2025 |
| Chloroform 2941 | Organic Chemical | 16 of 16 results | Aug 22, 2007 | Nov 20, 2025 |
| Bromodichloromethane 2943 | Organic Chemical | 16 of 16 results | Aug 22, 2007 | Nov 20, 2025 |
| Fluoride 1025 | Inorganic Chemical | 16 of 17 results | Oct 6, 2003 | Mar 11, 2025 |
| Dichloroacetic Acid 2451 | Organic Chemical | 14 of 15 results | Sep 28, 2009 | Nov 20, 2025 |
| Trichloroacetic Acid 2452 | Organic Chemical | 14 of 15 results | Sep 28, 2009 | Nov 20, 2025 |
| Dibromochloromethane 2944 | Organic Chemical | 11 of 16 results | Aug 7, 2013 | Nov 14, 2024 |
| Xylenes, Total 2955 | Organic Chemical | 7 of 33 results | Mar 29, 2004 | Aug 15, 2007 |
| Sodium 1052 | Inorganic Chemical | 6 of 6 results | Sep 16, 2019 | Feb 24, 2025 |
| Ethylbenzene 2992 | Organic Chemical | 6 of 33 results | Mar 29, 2004 | May 30, 2007 |
| Chromium 1020 | Inorganic Chemical | 5 of 17 results | Oct 6, 2003 | Feb 3, 2010 |
| Toluene 2991 | Organic Chemical | 5 of 33 results | Mar 29, 2004 | May 11, 2006 |
| Cadmium 1015 | Inorganic Chemical | 3 of 17 results | Mar 8, 2004 | Apr 11, 2005 |
| Combined Radium (-226 & -228) 4010 | Radionuclide | 2 of 12 results | Jun 12, 2018 | Sep 12, 2019 |
| Radium-226 4020 | Radionuclide | 2 of 12 results | Jun 12, 2018 | Sep 12, 2019 |
| Radium-228 4030 | Radionuclide | 2 of 12 results | Jun 12, 2018 | Sep 12, 2019 |
| Nitrate 1040 | Inorganic Chemical | 2 of 44 results | Jul 24, 2006 | Jul 24, 2006 |
| Selenium 1045 | Inorganic Chemical | 2 of 17 results | Apr 11, 2005 | Apr 11, 2005 |
| Sulfate 1055 | Inorganic Chemical | 2 of 2 results | Oct 6, 2003 | Mar 8, 2004 |
| Monobromoacetic Acid 2453 | Organic Chemical | 1 of 15 results | Sep 14, 2020 | Sep 14, 2020 |
| Dibromoacetic Acid 2454 | Organic Chemical | 1 of 15 results | Sep 18, 2018 | Sep 18, 2018 |
| Bromoform 2942 | Organic Chemical | 1 of 16 results | Sep 18, 2018 | Sep 18, 2018 |
| Nitrate-Nitrite 1038 | Inorganic Chemical | 1 of 44 results | Jul 24, 2006 | Jul 24, 2006 |
| Nickel 1036 | Inorganic Chemical | 1 of 17 results | Mar 8, 2004 | Mar 8, 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 81–90 of 310 samples, newest first — collected September 11, 2018 to September 18, 2018. The summary above covers all 310.
27 results from the 10 samples listed here: 15 detected, 12 not detected. Across the whole record it is 396 of 1,546. 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 |
|---|---|---|
|
||
| 1.07 ug/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| 3.19 ug/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 2.02 ug/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 4.76 ug/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 11.04 ug/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | TTHM 2950 | Jan 1, 2017 – Dec 31, 2019 |
|
||
| Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| 0.002 mg/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.002 mg/l , sample collected Sep 18, 2018 10:45, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jan 1, 2017 – Dec 31, 2019 |
|
||
| 0.0262 mg/l , sample collected Sep 12, 2018 06:10, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018 06:10, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.0618 mg/l , sample collected Sep 12, 2018 17:50, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018 17:50, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.021 mg/l , sample collected Sep 12, 2018, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.0216 mg/l , sample collected Sep 12, 2018 18:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018 18:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.111 mg/l , sample collected Sep 12, 2018 06:10, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018 06:10, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.0441 mg/l , sample collected Sep 12, 2018 06:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 12, 2018 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.091 mg/l , sample collected Sep 11, 2018 05:45, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 11, 2018 05:45, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
|
||
| 0.0525 mg/l , sample collected Sep 11, 2018 05:15, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 11, 2018 05:15, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2016 – Dec 31, 2018 |
-
- Collected
- Sep 18, 2018 10:45
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 180919-006TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 1.07 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- 3.19 ug/l
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 2.02 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 4.76 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950
- Result
- 11.04 ug/l
- Monitoring period
- Jan 1, 2017 – Dec 31, 2019
-
- Collected
- Sep 18, 2018 10:45
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 180919-005HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 0.002 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- 0.002 mg/l
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.002 mg/l
- Monitoring period
- Jan 1, 2017 – Dec 31, 2019
-
- Collected
- Sep 12, 2018 06:10
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-008PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0262 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 12, 2018 17:50
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-007PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0618 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 12, 2018
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-006PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.021 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 12, 2018 18:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-005PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0216 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 12, 2018 06:10
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-004PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.111 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 12, 2018 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-001PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0441 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 11, 2018 05:45
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-010PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.091 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Sep 11, 2018 05:15
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 180918-009PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2016 – Dec 31, 2018
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0525 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
Routine (10).