Drinking Water Quality Distribution Monitoring Data

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This dataset provides an overview of the U.S. Environmental Protection Agency’s (EPA’s) research results from investigating water quality monitoring sensor technologies that might be used to serve as a real-time contamination warning system (CWS) when a contaminant is introduced into a drinking water distribution system.

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Based on a review of available online water quality monitoring sensor technologies, an early determination was made that it was not technically feasible to accurately identify and quantify the many different types of contaminants that could potentially be introduced into the drinking water supply/distribution system.

Furthermore, because online sensor technologies need to be economically suitable for mass deployment within a distribution system, EPA focused its research on identifying sensor technologies that could be used to detect anomalous changes in water quality due to contamination event(s). Once a water quality anomaly is detected, the water utility operator is alerted, and further actions (e.g., sampling and analysis) could be undertaken by the operator to identify and quantify the contaminant if necessary. This report focuses on EPA’s research on pilot-scale evaluations of available online water quality monitoring sensor instrumentation.

Date Created


Last Modified




Update Frequency


Temporal Coverage

2015-01 to 2017-06

Spatial Coverage

United States


John Snow Labs; Data City of New York;

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Source Citation



Drinking Water, Water Quality, Water Utilities, Water Treatment Plant, Water Testing, Water Quality Testing, Water Treatment

Other Titles

Water Quality Distribution Monitoring Data, Drinking Water Supply or Distribution System

Sample_NumberWater Quality Sample Number for Monitoringintegerlevel : Nominal
Sample_DateDate of sample provided for Monitoringdate-
Sample_SiteWater Quality Sample Sitestring-
Sample_ClassSample Class (Compliance, Operational, Resample Compliance)string-
Water_Sample_LocationSample Location for Waterstring-
Residual_Free_ChlorineFree Chlorine in mg/Lnumberlevel : Ratio
Turbidity_NTUNephelometric Turbidity Unit (NTU)string-
FluorideFluoride in water (mg/L)numberlevel : Ratio
ColiformColiform in water (Quanti-Tray) (MPN /100mL)string-
E_ColiE. coli Bacteria Infection in water (Quanti-Tray) (MPN/100mL)string-
2015-02-1176550ComplianceSS - N/S Baisley Blvd, W/O Smith St0.281<1<1
2015-05-181SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.331.10.79<1<1
2015-05-241SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.650.90.83<1<1
2015-05-261SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.40.690.78<1<1
2015-05-271SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.50.950.82<1<1
2015-05-281SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.570.80.81<1<1
2015-06-061SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.520.770.7<1<1
2015-06-071SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.50.960.73<1<1
2015-06-121SCH4OperationalCity Turnnel No. 3 / Shaft 4B0.60.990.73<1<1