excerpt from
NEW JERSEY DEPARTMENT OF ENVIRONMENTAL PROTECTIONWELL TEST RESULTS FOR SEPTEMBER 2002 – APRIL 2007
(Of 51,028 wells) A total of 32,530 (64%) of the 51,028 wells tested exceeded one or more of the recommended upper limits for secondary parameters. Due to the nature of soils and geology, the ground water in the southern part of the state tends to be acidic (pH below 7), while ground water in the northern part tends to be neutral (pH = 7) to basic (pH above 7). Of the wells tested, 22,699 wells (45%) had pH values outside the recommended range of 6.5 to 8.5. Both iron and manganese are inorganic ions that occur naturally in soils and rocks throughout the state. A total of 14,751 (29%) wellsreported iron levels above the recommended upper limit of 0.3 mg/l, and 9,890 wells(19%) were above the recommended upper limit of 0.05 mg/l for manganese. (See Figure E2).