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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 131–140 of 310 samples, newest first — collected July 17, 2012 to October 10, 2012. The summary above covers all 310.

22 results from the 10 samples listed here: 4 detected, 18 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.

Chemical and radiological sample results for PRVWSD-Twin Harbor, every result from 131 to 140 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
Oct 10, 2012 07:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
121011-045
Laboratory
Radiation Safety Engineering
Not detected below 0.38 pci/l Minimum Reporting Level , sample collected Oct 10, 2012 07:00, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.54 pci/l Minimum Reporting Level , sample collected Oct 10, 2012 07:00, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.372 pci/l Minimum Reporting Level , sample collected Oct 10, 2012 07:00, sampling point TF102 Radium-226 4020 EPA method 903.1 Oct 1, 2012 – Dec 31, 2012
Not detected below 0.54 pci/l Minimum Reporting Level , sample collected Oct 10, 2012 07:00, sampling point TF102 Radium-228 4030 EPA method 904.0 Oct 1, 2012 – Dec 31, 2012
Collected
Sep 19, 2012 10:22
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120920-015CN
Laboratory
MSDH Lab
Not detected below 15 ug/l Minimum Reporting Level , sample collected Sep 19, 2012 10:22, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2011 – Dec 31, 2013
Collected
Sep 19, 2012 10:35
Sampling point
TF103
Sample type
Routine
Lab sample
120920-014CN
Laboratory
MSDH Lab
Not detected below 15 ug/l Minimum Reporting Level , sample collected Sep 19, 2012 10:35, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2011 – Dec 31, 2013
Collected
Aug 8, 2012 08:00
Sampling point
TF103
Sample type
Routine
Lab sample
120809-004
Laboratory
Radiation Safety Engineering
Not detected below 0.38 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 08:00, sampling point TF103 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.47 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 08:00, sampling point TF103 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.224 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 08:00, sampling point TF103 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
Not detected below 0.47 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 08:00, sampling point TF103 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Aug 8, 2012 07:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120809-003
Laboratory
Radiation Safety Engineering
Not detected below 0.38 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 07:45, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.54 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 07:45, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.372 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 07:45, sampling point TF102 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
Not detected below 0.54 pci/l Minimum Reporting Level , sample collected Aug 8, 2012 07:45, sampling point TF102 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Aug 8, 2012 08:00
Sampling point
TF103
Sample type
Routine
Lab sample
120809-004RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 8, 2012 08:00, sampling point TF103 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Aug 8, 2012 07:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120809-003RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 8, 2012 07:45, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 18, 2012 09:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120718-074PB
Laboratory
MSDH Lab
0.0709 mg/l , sample collected Jul 18, 2012 09:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012
0.0007 mg/l , sample collected Jul 18, 2012 09:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012
Collected
Jul 18, 2012 08:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120719-013PB
Laboratory
MSDH Lab
0.0132 mg/l , sample collected Jul 18, 2012 08:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 18, 2012 08:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012
Collected
Jul 17, 2012 07:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
120718-073PB
Laboratory
MSDH Lab
0.0408 mg/l , sample collected Jul 17, 2012 07:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 17, 2012 07:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2010 – Dec 31, 2012

Routine (10).