A massive fish kill along a 19-mile stretch of the Little Wood River in Idaho led to criminal charges and significant penalties for Avonmore West, Inc. and two individuals in 1999, stemming from an illegal discharge of ammonia in September 1998. The incident, discovered by the Idaho Division of Environmental Quality and the Idaho Department of Fish and Game, resulted in the death of over 64,000 fish, devastating the river ecosystem.
Investigations quickly pointed to Avonmore West, Inc. as the source of the pollution. Authorities determined the company knowingly discharged pollutants – specifically ammonia – into the Little Wood River without the required permits, a clear violation of federal environmental regulations. The timing of the discharge directly coincided with the observed fish kill, establishing a direct link between the company’s actions and the environmental damage.
On April 7, 1999, Avonmore West, Inc. and an individual identified as Royal were formally charged with violating the Clean Water Act (CWA), specifically 33 U.S.C. 1311(a) and 33 U.S.C. 1319(c)(2), pertaining to knowing violations of the Act. Both parties subsequently entered guilty pleas. A second individual, Woolf, was charged on August 19, 1999, with violating 33 U.S.C. 1311(a) and 33 U.S.C. 1319(c)(1) of the CWA and also pled guilty on November 3, 1999.
Sentencing and Restitution
The sentencing phase saw Avonmore West, Inc. receive 12 months of probation and a substantial financial penalty. In addition to a $100,000 federal fine, the company was ordered to pay $148,731 in restitution, distributed to multiple agencies involved in the river’s recovery. The Bureau of Land Management received $50,000, the Idaho Department of Fish and Game $46,774, the Idaho Department of Environmental Quality $1,957, and the Wood River Soil and Water Conservation District $50,000. Royal received a 12-month probation sentence and was mandated to complete 60 hours of community service. Woolf was sentenced to 12 months probation and ordered to pay a $500 federal fine.
Environmental Impact & Legal Ramifications
The Little Wood River fish kill serves as a stark reminder of the potential consequences of industrial pollution. While restitution efforts aim to mitigate the damage, the long-term ecological effects of such a large-scale event can be significant. The case highlights the EPA’s commitment to enforcing the Clean Water Act and holding companies accountable for environmental crimes. GrimyTimes will continue to monitor environmental enforcement cases and report on the pursuit of justice for impacted communities.
Key Facts
- Defendant: Avonmore West, Inc.
- Location: Little Wood River, Idaho
- Date of Incident: September 2, 1998
- Crime: Illegal discharge of ammonia, resulting in a fish kill
- Fish Killed: Over 64,000
- Laws Violated: 33 U.S.C. 1311(a) and 33 U.S.C. 1319(c)(1)(A), 33 U.S.C. 1319(c)(2)(a) (Clean Water Act)
- Penalties: $100,000 fine for Avonmore West, Inc., $148,731 in restitution, 12 months probation for Avonmore West, Inc. and Royal, 60 hours community service for Royal, $500 fine and 12 months probation for Woolf.
Source: EPA ECHO Enforcement Case Database
Related Federal Cases

