[
{
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  "sample_id": "TX133806",
  "primacy_agency_code": "TX",
  "epa_region": "06",
  "sar_id": 21278530,
  "contaminant_code": "PB90",
  "result_sign_code": null,
  "sample_measure": 0,
  "unit_of_measure": "mg/L"
},
{
  "pwsid": "TX0430049",
  "sample_id": "TX149895",
  "primacy_agency_code": "TX",
  "epa_region": "06",
  "sar_id": 23362622,
  "contaminant_code": "PB90",
  "result_sign_code": null,
  "sample_measure": 0,
  "unit_of_measure": "mg/L"
}
]