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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

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.

Every analyte ever detected for PRVWSD-Twin Harbor, 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 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 61–70 of 310 samples, newest first — collected November 12, 2019 to August 3, 2021. The summary above covers all 310.

32 results from the 10 samples listed here: 8 detected, 24 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.

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 PRVWSD-Twin Harbor, every result from 61 to 70 of 310 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
Aug 3, 2021 08:30
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-210804-166
Laboratory
MSDH Lab
0.106 mg/l , sample collected Aug 3, 2021 08:30, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 3, 2021 08:30, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
May 27, 2021 08:51
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
RU-210528-003
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 27, 2021 08:51, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Jan 1, 2013 – Dec 31, 2021
Collected
Apr 1, 2021 09:00
Sampling point
TF103
Sample type
Routine
Lab sample
NI-210401-062
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 09:00, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 09:00, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 09:00, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Apr 1, 2021 08:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-210401-061
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 08:45, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 08:45, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 1, 2021 08:45, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Dec 2, 2020 08:45
Sampling point
TF103
Sample type
Routine
Lab sample
NI-201203-023
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 08:45, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 08:45, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 08:45, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Collected
Dec 2, 2020 09:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-201203-022
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 09:00, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 09:00, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Dec 2, 2020 09:00, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Collected
Sep 14, 2020 13:30
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
200915-003TH
Laboratory
MSDH Lab
15.2 ug/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 14, 2020 13:30, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
2.41 ug/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 14, 2020 13:30, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
17.6 ug/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 TTHM 2950 Jan 1, 2020 – Dec 31, 2020
Collected
Sep 14, 2020 13:30
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
200915-013HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 14, 2020 13:30, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.007 mg/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.009 mg/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.007 mg/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 14, 2020 13:30, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.023 mg/l , sample collected Sep 14, 2020 13:30, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2020 – Dec 31, 2020
Collected
Nov 12, 2019 09:30
Sampling point
TF103
Sample type
Routine
Lab sample
191113-018NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:30, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:30, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:30, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019
Collected
Nov 12, 2019 09:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
191113-017NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:00, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:00, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Nov 12, 2019 09:00, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2019 – Dec 31, 2019

Routine (10).