That's because in June 2004 the Washington Aqueduct started adding a chemical called orthophosphate to the water.    From Wordnik.com.  [Study of D.C. water sharpens understanding of lead threat] Reference

By January 2006, the orthophosphate treatment had brought the city into compliance.    From Wordnik.com.  [Study of D.C. water sharpens understanding of lead threat] Reference

Part of the dissolved aluminum can subsequently settle in the sediments of atmospherically acidified lakes and reservoirs, reducing orthophosphate availability and disrupting the phosphorus cycling in those water bodies.    From Wordnik.com.  [Inorganic nitrogen pollution in aquatic ecosystems~ causes and consequences] Reference

What they had was one established ornery j l, a trendy reverse and a dickey but unshielded parliament orthophosphate.    From Wordnik.com.  [Rational Review] Reference

The Liberian government says a three-month investigation found high levels of orthophosphate being released into the water.    From Wordnik.com. Reference

Analyses for TP double for every 10°C rise in temperature, as rates do in many and orthophosphate were by the USBR laboratories in Den - biochemical reactions.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Although much is known about the transport of orthophosphate in soils, very little is known about the fate of phytate, a compound that is indigestible by poultry and abundant in poultry litter.    From Wordnik.com.  [innovations-report] Reference

New Yorkers drink their water from Esopus Creek, from Schoharie Creek, from the Neversink River, straight from the city’s many reservoirs, with only a rough screening and, for most of the year, just a shot of chlorine and chasers of fluoride, orthophosphate and sodium hydroxide.”.    From Wordnik.com.  [The Good News About New York City's Water] Reference

3) When 10ppb is exceeded, zinc orthophosphate is added to form scale and prevent lead leachate.    From Wordnik.com.  [JSOnline.com] Reference