Nitrates lists all nitrates test results by date then by source for those with multiple sources. Not all water systems will have reports, only those that use surface water. Total Trihalomethane results includes the quarterly average and running yearly average for the system. Individual samples results are not recorded, we only record the average for all samples in that quarter. Systems using surface water must test each quarter, those using groundwater can test yearly.
Violations includes the period the violation occurred and what rule was broken.