Main Telephone Number:
State Park Health Center
8500 Farrow Rd Building #12
Columbia, SC 29203
Office of Environmental Laboratory Certification SCDHEC
2600 Bull Street
Columbia, SC 29201
The information posted to this page is meant to assist laboratories in reporting data to DHEC. But keep in mind that the ultimate authority for what is acceptable and what is not acceptable resides with the DHEC program area receiving and reviewing the data. Should information contained within this site differ from permit requirements or specific instructions provided by the program area to laboratories or clients, the program area's directions take precedence over the information found on this site.
DHEC has come up with a list of Practical Quantitation Limits (PQLs) to be used for NPDES reporting. This comes from Regulation 61-68. The PQL is defined as "the concentration at which the entire analytical system must give a recognizable signal and acceptable calibration point. It is the concentration in a sample that is equivalent to concentration of the lowest calibration standard analyzed by a specific analytical procedure, assuming that all the method-specific sample weights, volumes, and processing steps have been followed." In other words, the PQL is equal to the lowest non-zero standard on your calibration curve.
DHEC has come up with standard PQLs that every laboratory reporting compliance data is expected to achieve. If the
laboratory meets the PQL as defined by DHEC and the sample has a concentration below that PQL, then the facility may
report zero as the result on the DMR form.
Please see the following examples:
Make sure that you use a certified laboratory that can meet the published PQLs. There are many certified laboratories and they may use different equipment which would allow some to meet the PQL and others not. Make sure that the DMR form is completed properly with the certified lab ID number beside each analysis performed by the contract lab. Make sure that the correct number is reported as the result on the DMR form.