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Bacteriological Sample Collection
Beginning January 1, 2017, the Safe Drinking Water Program reinstated the bacteriological sample collection program for all public water systems statewide. Additionally, the Safe Drinking Water Program began to collect and analyze the total trihalomethanes (TTHMs) and haloacetic acids (HAA5) samples for water systems statewide. The Department will continue to provide sample collection containers and forms, scheduled transportation of routine samples from our parish health units to our state laboratories, and analysis of these samples. Bacteriological samples submitted to LDH laboratories must be collected in a sample container supplied by LDH. Bacteriological samples collected in a non-LDH sample container will be rejected.
Laboratory Bacteriological Sample Drop-off Calendar and Truck Routes
The laboratory bacteriological sample calendar and truck routes are updated regularly to inform samplers when and where to drop-off samples at Parish depots for transport to one of the five bacteriological laboratories.
Truck routes for the transport for bacteriological samples to the State Laboratories (Baton Rouge, Shreveport, Alexandria, Lake Charles, and Amite). Plan accordingly to make scheduled pickup times so samples can reach the lab within the 30-hour hold time.
Bacteriological Sample Collection Bottles
NOTE: LDH laboratories require IDEXX sample bottles for the collection of bacteriological samples. Whirl-Pak bags are not accepted by LDH laboratories. IDEXX sample bottles can be picked up at the sample depots and LDH laboratories. Please pick up only what you need, as the IDEXX bottles are for all water systems in the state.
Sample collection tips and rejection criteria — Do not let the sodium thiosulfate fall out of the IDEXX bottle (powder).
- Fill the IDEXX bottles to the 100 mL line. Overfilling and underfilling samples will result in sample rejection.
- LDH laboratories no longer accept Whirl-Pak bags. Samples received in Whirl-Pak bags will be rejected.
- IDEXX Water Vessels Expirations
***REVISED Bacteriological Sample Monitoring and Collecting Presentations***
- Bacteriological Monitoring Requirements - Revised Total Coliform Rule (TCR) and Ground Water Rule (GWR) requirements for bacteriological sampling.
- Bacteriological Sample Collection Procedures - Procedure for collecting samples with new IDEXX sample bottles and preparation of samples for transport to the laboratory.
- Approved Bacteriological Sample Taps - Requirements of what is an approved sample tap for sample collection.
- Sample Tap Selection - Information on identifying suitable taps for bacteriological sample collection. Also identifies taps to avoid.
- Lab 8 Form - Instructions on completing the Lab 8 form for submitting samples to the State Laboratory.
- Hach Test Kit for Chlorine Residuals - Instructions on collecting a low/high range chlorine residual with the Pocket Colorimeter II. Always refer to the manual provided with the Pocket Colorimeter II. This presentation is for additional clarification.