Add drinking water data

[ezufall]

including 1) measure of problem eg # violations, 2) measure of systems, eg count and/or consolidation, and 3) measure of source, eg what % relies on GW. Consider option to aggregate CWS data by GSP area, using Vanderbilt CWS shapefiles (https://lab.vanderbilt.edu/dwjlab/research/united-states-community-water-system-cws-estimated-service-area-boundary-esab-geospatial-database/) and GSP_submitted shapefiles (on Box under data_spatial_raw or downloadable at https://sgma.water.ca.gov/webgis/?jsonfile=https%3a%2f%2fsgma.water.ca.gov%2fportal%2fresources%2fjs%2fmapconfigs%2fGspSubmittalsConfig.js&_dc=0.23941161367525954)

[tylerandrewscott]

ok I made a script that grabs drinking water data -- the end just creates a summary dataframe but doesn't save it or merge it, since I didn't want to overbuild something that didnt' fit into your current workflow. this can be played with a bit, right now it creates a count of PWS by GSA, health violation count (2014-2018) by GSA, and proportion of service connections reliant on groundwater by GSA. all adjustable. PWS boundary from state, other two files are downloaded to temp directories, not saved.