+<sup>*TDS data from WQP may contain duplicates. Duplicates are identified when they have the same ActivityIdentifier. If duplicates are identified, only one is kept as identified by its USGS pCode. The order of preference for the pCodes is: [70300](https://help.waterdata.usgs.gov/code/parameter_cd_nm_query?parm_nm_cd=70300&fmt=html), [70301](https://help.waterdata.usgs.gov/code/parameter_cd_nm_query?parm_nm_cd=70301&fmt=html), [70303](https://help.waterdata.usgs.gov/code/parameter_cd_nm_query?parm_nm_cd=70303&fmt=html).
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