Quadbill Postcards…. The most efficient and cost-effective method fo paper billing for municipal water and utility districts. Postcard billing saves money on postage and on time. No more stuffing envelopes! Quadbills are high-quality, heavy-duty paper perforated to break down into four individual postcards for mailing. Each postcard then breaks down into two pieces for bill and receipt. Quadbills will print on any standard laser printer and are compativle with most utility billing software.