Manure lagoons vs septic systems?

How do dairy manure lagoons compare to On-Site Sewage Systems, otherwise known as septic systems when it comes to nitrate in groundwater? We published information showing government scientists stating that just five residential septic systems serving 12 people contribute up to TEN TIMES MORE nitrate than a one acre manure lagoon. Dairy farm critics scoffed, calling us liars and claiming that the public was not stupid and wouldn’t believe us. But, read the detailed analysis below and decide for yourself. We say those government scientists, by the own sources they use, were actually quite conservative.