However, one contaminant in water tends to remain the same throughout the year and that is p H.
Assuming the answer is yes, then from a risk assessment point of view you can assume that the water will fail to meet the standards for microbiological contamination.
With regard to testing, research tells us that the quality of a surface derived source is determined by the prevailing weather conditions.
This in effect means you could test in the morning and get a microbiological pass and test in the evening and get a fail.
Not a lot of people know that 🙂 We are often asked about water testing.
I have enclosed a typical response in the hope that some people will find it helpful.
“With regard to your spring, if it is a true spring then it may not require filtration.However, true springs are very rare and most springs can best be described as surface derived sources.Here is a picture recently taken at Fountains Abbey.The right side of the wall is made of Limestone and right hand side is made of Sandstone.The relevance is, if water passes over the Limestone it will pick up calcium and magnesium, making the water hard.Water passing over the Sandstone is probably going to be soft, acidic and may turn water brown / black.