We utilized Berkshire Enviro for the testing we needed to have done on our new well prior to converting from our construction loan to our primary mortgage.
Berkshire Enviro stepped up to the plate right away telling me which tests the bank would most likely require and promised me a turnaround of less then a week (verbal results). We were under the gun trying to get the closing done before a certain date
Their prices are reasonable too..
Berkshire Enviro came in under the wire a winner! I would definitely use them for any residential testing you may need.