Service Area

Perc Testing

Percolation Testing (Perc)

This is the procedure that is required by DEP to determine the permeability (how easily water will pass through) of the soil. A perc test is the procedure specified by DEP in which water is poured into the soil. The amount of time the water takes to dissipate is recorded to determine the soil's permeability. The permeability or impermeability of the soil determines the size of the leaching field portion of the septic system.

In some instances a standard percolation test cannot be performed due to the presence of groundwater. In these instances the DEP allows the use of a sieve analysis in place of a standard perc test. (Sieve Analysis is not allowed for new construction or increased flow, it is only allowed for the repair\upgrade of an existing septic system).

Helpful links:
MA DEP: Water, Wasteland and Wetlands Help Center


Grady Consulting L.L.C. is located in Kingston, Massachussetts and offers services to the South Shore and the Cape and Islands area. In the past, we have performed work for satisfied clients in Abington, Acton, Ashland, Attleboro, Avon, Barnstable, Bedford, Bellingham, Berkley, Boston, Bourne, Braintree, Bridgewater, Brockton, Canton, Carver, Chatham, Cohasset, Concord, Dartmouth, Dedham, Dover, Dunstable, Duxbury, East Bridgewater, Easton, Fairhaven, Falmouth, Fitchburg, Foxboro, Franklin, Greenville, Halifax, Hanover, Hanson, Holbrook, Holliston, Hull, Humarock, Hyannis, Kingston, Lakeville, Marion, Marshfield, Marthas Vineyard, Medfield, Medway, Middleboro, Milton, Nantucket, Natick, Needham, New Bedford, Newton, North Hampton, Norwell, Norwood, Osterville, Pembroke, Plymouth, Plympton, Portsmouth, Quincy, Randolph, Rochester, Rockland, South Weymouth, South Yarmouth, Sandwich, Scituate, Sharon, Sterling, Stoughton, Sturbridge, Sudbury, Sutton, Swansea, Taunton, Waltham, Wareham, Wayland, Wellesley, West Bridgewater, Westboro, Westford, Weston, Westport, Westwood, Weymouth, Whitman, Wilbraham, and Yarmouth.