Fiberglass underground and aboveground tanks for fire protection water are in high demand as a result of increased regulations and insurance industry requirements. Whether it is a sole source of water in rural areas or as a standby water reservoir to supplement a pressurized municipal water system, a Xerxes tank provides maintenance-free, corrosion-resistant water storage. System design options utilizing fiberglass underground tanks are recognized in NFPA 22, Water Storage Tanks for Fire Protection Systems, as well as NFPA 1142, Water Supplies for Suburban and Rural Fire Fighting.