this article is a reprint of from the DEP website. Please click to that website for further information.
Mining Hazards & Problems
The most common complaints from residents living near to a quarry are:
- Dust
- Truck traffic
- Noise
- Blasts
- Loss or degradation of water supply
- Stream effects
- Sinkholes
Generally, quarries can be good neighbors in their community and provide valuable services and products but many people don’t want a quarry in their backyard because they are concerned about the issues listed above.
Dust. Disturbing the surface and breaking rock causes dust. A quarry operation must have procedures in place to contain the dust and not allow it to become a problem off the site. Dust control measures are described in the permit documents. Some municipalities require truck beds to be covered with tarp which cuts down on dust during transport. Traffic, wind and certain soil conditions also create dust problems. But, if you have a concern that a quarry is causing the dust problem, you may file a complaint with the District Office that serves your area.
Truck traffic. Haul trucks can be bothersome on local roads. However, if the road is capable of supporting the size and weight requirements, these vehicles have a right to use the roads. Once the trucks leave the permitted site, the DEP has no further jurisdiction to stop them or control the traffic. DEP does not regulate truck traffic and the permits do not contain any restrictions on it. A complaint regarding truck traffic must be directed to the entity that owns and maintains the roadway (municipality or PennDOT).
Noise. Noise can also be a nuisance to nearby residents. There are several noise-reducing strategies that the operator can take advantage of to lessen the effect. Often noise complaints are brought up during public meetings. While the DEP does not have very specific regulations on noise, we cooperate in helping the operator satisfy the surrounding residents.
Blasts. Explosives are highly regulated in Pennsylvania. Quarry blasts must be designed to meet limits for noise, air blast and ground vibration. However, some people are disturbed by blasts that do not actually cause damage. Additional measures can be taken to lessen the effects from blasting. Certain weather conditions or location of the blast in the quarry can make one blast feel worse than another. If you suspect blasting has damaged a structure, please contact the District Mining Office. For more, see the fact sheet “Citizen’s Guide to Explosive Regulations in Pennsylvania”
Loss or degradation of water supply. Quarries that pump groundwater may have a detrimental effect on surrounding wells and springs. The extent of the effect is evaluated in the permit application. Then, measuring of the groundwater levels takes place to monitor the changes. It is not illegal for the quarry company to compromise a water supply but they must replace it if they affect it. For more information, see the fact sheet “Quarries and Your Water Supply”. If you feel your water supply has been negatively affected due to mining activity, please contact the District Mining Office.
Stream effects. Many quarries must discharge excess water in order to remain operational. The water can accumulate because of mining below the groundwater elevation or it can collect in the pit after a precipitation event. To eliminate that water, a discharge permit might be part of the mining permit. A federal discharge permit, called an NPDES (National Pollutional Discharge Elimination System) permit is incorporated. The discharge must be within range for quantity and quality specified in the permit. Both the operator and the mining inspector collect regular samples. If you believe that the quarry discharge is degrading a stream or is not meeting the effluent requirements, the DEP will send an inspector to sample the water.

Sinkholes. Limestone quarries that pump groundwater can potentially induce sinkholes to form around the quarry area, especially where surface water runoff or stream flow occurs. If mining activity is found to be responsible, quarries are required to repair the holes that form. However, if structural damage occurs, the DEP does not have the legal authority to demand that the operator replace the structure or pay damages. Sinkholes can form for various reasons unrelated to quarries. If you live in a sinkhole-prone area, you should be aware of the best practices for handling stormwater runoff in karst areas and carry a provision for sinkhole insurance on your homeowner’s policy. If you have a sinkhole occur that you feel is a result of quarry activity, please contact the District Mining Office whereby a hydrogeologist will investigate the incident. For more on sinkholes, visit the sinkhole page or view this publication - Sinkholes.
Hazards that may occur in quarries are highwall failures, accidents or spills.
- A responsible quarry company takes precautions to protect the workers and surrounding community but accidents occur. DEP will investigate industrial accidents at the site, along with federal inspectors.
- Highwalls can be dangerous if trespassers are careless. Fencing is not required under regulations. Berms are required - they must be high enough to provide a visual and physical barrier surrounding the quarry and in various places within it. Sometimes, highwalls fail and a rock fall or slide results. DEP inspectors and technical staff consider and examine the stability of highwalls during site visits and within the mining plans. Occasionally, geology, weather, and/or surrounding conditions combine in such a way that unexpected failures occur. These are rare.
- Abandoned quarries and even some active quarries may contain areas of deep, cold water that are dangerous for swimmers. Quarries are unsafe areas for trespassers. Remember: Stay Out. Stay Alive.
- Spills of hazardous materials are also rare. Industrial sites using hazardous materials have response plans in case of spills.
If you suspect a highwall is in a dangerous condition, please contact the District Mining Office and a geologist and engineer will investigate. If you must report an accident, spill or other emergency, please call 911 and DEP emergency response will be notified.