To ensure accuracy, many tests require that the sample be received at the laboratory within a certain time period. Coliform bacteria samples, for example, must be received within 48 hours after sample collection. If you have difficulty getting your water samples to the laboratory by mail within 48 hours, check with your post office for advice on the best time to mail parcels. If that doesn't help, you may need to contact a carrier service that specializes in parcel delivery. Choosing a Laboratory In Iowa, laboratories that perform water analysis for public water supplies must be certified by the Iowa Department of Natural Resources.
Certification helps ensure that public water supply testing is accurate.
You can benefit from laboratory certification, too. Before selecting a lab, simply inquire if it is state-certified to test public water supplies for the contaminants in which you are interested.