HARRISBURG — A report from a Pennsylvania environmental group says companies drilling for natural gas in the lucrative Marcellus shale have tallied more than 1,400 violations of state rules since January 2008.

The report from the Pennsylvania Land Trust Association says 952 violations had environmental implications.

According to the report, the state Department of Environmental Protection has recorded 100 violations of Pennsylvania's Clean Stream Law, 268 violations related to waste water reservoirs and 154 violations for discharging industrial waste.

The report is based on a right-to-know request filed by the group for DEP enforcement records.

Drilling advocates say the report shows state oversight of the industry is working.