Quick Answer
A sudden, significant drop in water temperature, typically more than 5-7°C (9-13°F), can indicate contamination of a well. This change in temperature can also be accompanied by unusual odors, discoloration, or sediment.
Water Temperature Changes in Wells
When digging a well, it’s essential to monitor the water temperature. A well that is properly sealed and protected from surface contamination should exhibit a relatively stable temperature, typically within 1-3°C (1.8-5.4°F) of surface temperature. However, sudden changes in temperature can indicate contamination.
Indicators of Well Contamination
One key indicator of well contamination is a significant drop in water temperature, often accompanied by unusual odors, discoloration, or sediment. For example, if the water temperature drops from 15°C (59°F) to 5°C (41°F) within a short period, it may indicate contamination. Additionally, a sudden increase in temperature, often accompanied by a milky or cloudy appearance, can also indicate contamination.
Assessing Well Temperature
To assess the temperature of a well, use a thermometer specifically designed for water temperature measurement. Dip the thermometer into the well and wait for at least 30 seconds to 1 minute to allow it to stabilize. Record the temperature and compare it to the surface temperature. If there is a significant difference, investigate the well and surrounding area for potential contamination sources.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.