USEPA/ORD_SAB_Model

## Version 3.0 Now Available (March 17, 2026), see /Version_History for Details Version 3.0 extends the drinking water service area boundaries to include Transient and Non-Transient Non-Community Water Systems. The service areas for community water systems are identical to the release of version 2.1. ## Project Description The Office of Research and Development has released a publicly available dataset of community water system (CWS) service area boundaries (SAB). CWS are defined as systems that provide water for human consumption through pipes or other constructed conveyances to at least 15 service connections or serves an average of at least 25 people year-round [1]. Under the safe drinking water act (SDWA) and various drinking water rules (see EPA Drinking Water Regulations) public water systems must test and report on the quality of their drinking water. These boundaries enable linking SDWA violations to their associated geographic areas, and concomitantly linking treated community water system water to their respective customers. This service area boundary dataset is a combination of publicly available service area boundaries and modeled boundaries. This repository documents how the data was collected and modeled and details the modeling techniques used to generate this dataset. All R scripts used in the production of the dataset are available here. ## Repository Guide This repository is split into folders which contain data, code and analysis used to create the ORD service areas. **Analysis** Various code and documents with supporting analyses. **Documentation** Document describing the process for creating the service area dataset. **External_Boundaries** Contains source information for boundaries obtained from state and utility sources. **Input_Data** This folder contains raw data that is needed to initiate the execution of code. Some large datasets are not included in this folder and need to be downloaded by the end user. These are described in the README file within the 'Input_Data' folder. **Version_History** Current dataset location and archive of all previous version updates. **Workflow** This folder contains all of the code used in the creation of the boundaries. Another 'Data' folder also exists within the 'Workflow' folder, which contains data created throughout the process. More information on the code can be found in the README file within the 'Workflow' folder. ### Disclaimer The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity , confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.

标签：后端开发