In general, standing water in your yard is never a good sign, but, in some cases, it could be that your septic tank is just in need of repairs. It could also be that you need to address an issue with the drain field itself. You can treat your drain field by planting new grass and plants in the field, or by adding a chemical cleaner to the tank. It may be necessary to have your drain field mechanically aerated in order to address the standing water.
But if repairs don’t get rid of the standing water, it’s likely because your septic tank isn’t processing and cycling waste properly. In instances like these, a new tank can address your standing water issues.