Bimonthly samples are collected from 29 locations: 15 on the Ohio River main stem, and 14 on major tributaries:

The samples include total suspended solids, total dissolved solids, sulfate, chloride, bromide, total hardness, total phosphorus, total organic carbon, ammonia nitrogen, nitrate/nitrite nitrogen, total Kjeldahl nitrogen, phenols, and cyanide.

In addition to the above parameters collected bimonthly at 29 locations, trace metals are analyzed concurrently at the 15 Ohio River locations. ORSANCO adopted criteria for several inorganic toxicants to protect human health and against chronic (long-term) and acute (short-term) toxicity to aquatic life.

All samples are analyzed at a central laboratory to maintain Quality Assurance/Quality Control protocols. Cyanide analyses are only conducted at eight of the upper-river sites during the months of January, March, and November. During warmer months, cyanide quickly decomposes into ammonia and carbon dioxide and is rarely detected, and as such, is only analyzed during winter months.

ORSANCO submitted bimonthly data from 1975 through the most current analyses to USEPA’s Water Quality Exchange (WQX), and the National Water Quality Monitoring Council’s Water Quality Portal.  You may also contact Ryan Argo for more information.

Ammonia Data

Bimonthly Monitoring Data 2000-2020 Download