3 Read and process TDS data (2015-2018)

3.1 Read all TDS data (2015-2018)

tds_sw=readWQP(type="result",
              statecode="US:49",
              characteristicName="Total dissolved solids",
              start_date="01/01/2015", end_date="12/31/2018",
              print=F, coerce_num = TRUE)

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