Nacogdoches Water Hardness & Quality Report (2026)

Nacogdoches, Texas, the Nacogdoches County seat — one of the oldest cities in Texas (Nacogdoches claims to be the 'Oldest Town in Texas' — it was an important Spanish mission town and one of the earliest established communities in Texas, a major stop on the Old San Antonio Road or El Camino Real de los Tejas), home of Stephen F. Austin State University (a major regional university in east Texas), a diverse Nacogdoches County community with a significant African-American, Hispanic-American, and Native American population, in the heart of the east Texas Pineywoods (the Angelina and Davy Crockett National Forests surround the Nacogdoches area), and one of the nine historically significant cities of the Texas colonial period — draws its municipal water supply from Lake Nacogdoches via the City of Nacogdoches Water Division. Water hardness in Nacogdoches measures 90.5 mg/L — classified as moderately soft.

Nacogdoches's moderate softness reflects the east Texas Pineywoods watershed's calcareous-poor Eocene coastal plain geology. The Lanana Creek watershed (Lake Nacogdoches) at Nacogdoches County drains: the Eocene Reklaw Formation (calcareous-poor sandy clay of the east Texas coastal plain); the Eocene Queen City Sand (calcareous-poor sandy formation); and the East Texas Pineywoods surface geology (calcareous-poor). City of Nacogdoches treatment produces the moderate 90.5 mg/L.

With hardness at 90.5 mg/L, Nacogdoches residents enjoy moderately soft water. City of Nacogdoches Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.