Residents of New Hampshire experienced a rare seismic event on January 27, 2025, when a 4.8 magnitude earthquake shook the region. While this earthquake may not have caused significant structural damage, it raises important questions for homeowners with private wells about how such events can affect groundwater levels and water quality. At Advance Pump & Filter, we’re here to explain what you need to know about the impact of earthquakes on your well water and how to ensure your water remains safe and clean.
How Earthquakes Impact Groundwater Levels
When seismic waves pass through an area, they can cause groundwater levels in wells to oscillate up and down, much like the surface of a shaken water glass. In some cases, the water level might stabilize at a higher or lower position after the shaking ends. For example, the largest recorded earthquake-induced offset in a well was a one-meter rise in water level. This kind of change is often due to shifts in the underground aquifer system, where seismic activity can compress or expand the layers that store groundwater.
Although these effects are more common in areas closer to the earthquake’s epicenter, they can still be observed in regions where shaking is moderate. If you notice any unusual changes in your well’s water levels following an earthquake, it’s a good idea to have it checked by a professional.
Changes in Water Quality
Earthquakes can also affect water quality in wells, particularly in areas where shaking was strong enough to be felt. One common issue is turbidity, where shaking dislodges loose sediment from the pores and cracks in the rocks that supply water to your well. This can make your water appear cloudy or dirty. Fortunately, turbidity is usually temporary and resolves within hours or days.
More concerning are situations where strong shaking damages nearby sewer lines, gas lines, or other infrastructure containing hazardous materials. If these systems leak, contaminants can infiltrate the groundwater, posing a risk to health. Although this is rare, it’s crucial to test your water for contaminants if you suspect any infrastructure damage in your area.
Subtle Chemical Changes
Even when no visible issues are apparent, scientific studies show that earthquakes can cause small changes in the chemistry of groundwater. Increased permeability below the surface can connect aquifers to formations with water of different chemical compositions. These changes are usually minor and not harmful, but they highlight the importance of regular water testing, especially after a seismic event.
What You Can Do
If you’re a private well owner in New Hampshire, here are steps you can take to ensure the safety and quality of your water after an earthquake:
- Monitor Water Levels: If you notice sudden changes in your well’s water level, contact a professional to assess the situation.
- Check for Turbidity: If your water becomes cloudy, avoid using it for drinking or cooking until the turbidity clears. Consider running your water through a filtration system or having it tested if the problem persists.
- Test for Contaminants: After a significant earthquake, schedule a water quality test to check for potential contamination, particularly if there’s infrastructure damage nearby.
- Inspect Your Well System: Hire a licensed well professional to inspect your well and ensure all components are functioning properly and safely.
Trust Advance Pump & Filter for Your Well Water Needs
At Advance Pump & Filter, we’ve been serving homeowners in Lee, NH, and the surrounding areas for decades. Whether you need water testing, filtration systems, or well maintenance, our team is here to help. If you have concerns about your well water following the January 27th earthquake, don’t hesitate to reach out to us.
Contact Advance Pump & Filter today at 603-868-3212 to schedule a consultation or learn more about how we can support your well water needs.
Resource:
https://www.usgs.gov/faqs/how-does-earthquake-affect-groundwater-levels-and-water-quality-wells
NOMINATE a small but MIGHTY business here: 
