Six-Year Review 4 Compliance Monitoring Data (2012-2019)
In July 2024, EPA announced the review results for the Agency’s fourth cycle of the Six-Year Review (called Six-Year Review 4). EPA analyzed compliance monitoring data for the Six-Year Review 4 using data provided by states/primacy agencies through the Information Collection Request (ICR) for Six-Year Review 4 covering from January 2012 through December 2019.
Each zip file below contains data for multiple contaminants and related information that can be unzipped into tab delimited text files. The number of records and associated systems in the data files and the size of the files range considerably from contaminant to contaminant, which may be attributed to many factors such as the applicability of monitoring requirements, the required sampling frequency and results from quality assurance/quality control (QA/QC) measures.
A detailed description of the data fields and their definitions, notes about the data, and instructions for downloading and importing datasets into software applications such as Excel can be found in the User Guide.
- Learn more about zip files
- Read the Data Management and Quality Assurance/Quality Control (QA/QC) Process for the Fourth Six-Year Review Information Collection Request Dataset (pdf)
Six-Year Review 4 ICR Dataset Zip Files (grouped by category)
Organic and Inorganic Chemicals (grouped alphabetically)
SYR4_PhaseChem_1.zip (1,1,1-Trichloroethane to Atrazine) (94.4 MB) (zip)
SYR4_PhaseChem_2.zip (Barium to Cyanide) (107 MB) (zip)
SYR4_PhaseChem_3.zip (Dalapon to Hexachlorocyclopentadiene) (80.6 MB) (zip)
SYR4_PhaseChem_4.zip (Hybrid Nitrate to Nitrate) (89.2 MB) (zip)
SYR4_PhaseChem_5.zip (Nitrate-nitrite to Total PCBs) (99.7 MB) (zip)
SYR4_PhaseChem_6.zip (Toxaphene to Xylenes) (39.9 MB) (zip)
Radionuclides
SYR4_Rads.zip (All Radionuclides) (7.8 MB) (zip)
Disinfection Byproducts & Precursors
SYR4_THMs.zip file contains individual files for:
- Total Trihalomethanes (TTHM)
- Bromodichloromethane
- Bromoform
- Chloroform
- Dibromochloromethane
SYR4_HAAs.zip file contains individual files for:
- Haloacetic Acids (HAA5)
- Bromoacetic acid
- Dibromoacetic acid
- Dichloroacetic acid
- Monochloroacetic acid
- Trichloroacetic acid
SYR4_Bromate_Chlorite.zip (1.76 MB) (zip)
SYR4_Bromate_Chlorite.zip contains individual files for:
- Bromate
- Chlorite
Disinfection Byproduct Related Parameters Datasets
SYR4_DBP_Related Parameters.zip (27.2 MB) (zip)
SYR4_DBP_Related Parameters.zip contains individual files for:
- DOC
- pH
- SUVA
- Total Alkalinity
- Total Organic Carbon (TOC) (raw and finished TOC)
- Paired TOC and Alkalinity
- UV_absorbance
Microbials
SYR4_TC.zip (Total Coliform files by individual years) (296 MB) (zip)
SYR4_TC.zip contains individual files for:
- Total Coliform_2012
- Total Coliform_2013
- Total Coliform_2014
- Total Coliform_2015
- Total Coliform_2016
- Total Coliform_2017
- Total Coliform_2018
- Total Coliform_2019
SYR4_EC_FC_HPC_Giardia.zip (125 MB) (zip)
SYR4_EC_FC_HPC_Giardia.zip contains individual files for:
- Escherichia coli (EC)
- Fecal coliform (FC)
- Giardia Lamblia
- Cryptosporidium
- Coliphage
- Enterococci
- Heterotrophic Plate Count (HPC)
SYR4_Disinfectant Residuals.zip (74.1 MB) (zip)
SYR4_Disinfectant Residuals.zip contains individual files for:
- Chloramines
- Chlorine
- Chlorine dioxide
- Free Residual Chlorine
- Residual Chlorine
- Total Chlorine
SYR4_Paired Microbes_DR (Disinfectant Residuals).zip (217 MB) (zip)
SYR4_Paired Microbes _DR.zip contains individual files for:
- Paired EC_DR
- Paired FC_DR
- Paired TC_DR_2012
- Paired TC_DR_2013
- Paired TC_DR_2014
- Paired TC_DR_2015
- Paired TC_DR_2016
- Paired TC_DR_2017
- Paired TC_DR_2018
- Paired TC_DR_2019
Paired data files for potential Microbial Disinfection Byproduct Rules (MDPB) revision: Total Organic Carbon and Alkalinity data (contained in SYR4_DBP_Related Parameters.zip) and the set of paired microbial vs. disinfection residual files (contained SYR4_Paired Microbes_DR (Disinfectant Residuals).zip) were created for the potential MDBP rules revision effort.
Aircraft Drinking Water Rule Data
SYR4_ADWR Compliance Data.zip (1.07 MB) (zip)
SYR4_ADWR Compliance Data contains
- Aircraft PWS Inventory
- Aircraft PWS samples by air carrier
Additional Data Collected Under SYR4
SYR4_Treatment.zip (Treatment Information) (8.79 MB) (zip)
SYR4_CryptoBinning.zip (Calculated LT2 Binning Information) (77.9 KB) (zip)
SYR4_CorrectiveActions.zip (Corrective Action information) (1.03 MB) (zip)