Call a service to check on values from: https://api.waterdata.usgs.gov/samples-data/codeservice/docs.
Examples
# \donttest{
groups <- check_param("characteristicgroup")
states <- check_param("states")
countries <- check_param("countries")
counties <- check_param("counties")
sitetypes <- check_param("sitetype")
samplemedia <- check_param("samplemedia")
characteristics <- check_param("characteristics",
group = "Biological")
observedProperties <- check_param("observedproperty",
text = "phosphorus")
# }