(Portland, OR) -- The Oregon Health Authority has installed 111 water treatment systems in homes using wells for drinking water near Hermiston and Boardman. Testing shows the well water has nitrates that are above safe levels. Pregnant women and babies face the greatest risk. The state has offered free testing since last year. Households with dangerous levels of nitrates can get free water delivery. Homes with higher levels can get free reverse-osmosis treatment systems. Kitchen tap filters can't remove nitrates at higher levels.