Iowa Code » Chapter 455B — JURISDICTION OF DEPARTMENT OF NATURAL RESOURCES
Iowa Code

Iowa Code § 455B.186 (2026)

Prohibited actions

✓ current as of July 2026
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1. A pollutant shall not be disposed of by dumping, depositing, or discharging such pollutant into any water of the state, except that this section shall not be construed to prohibit the discharge of adequately treated sewage, industrial waste, or other waste in accordance with rules adopted by the commission. A pollutant whether treated or untreated shall not be discharged into any state-owned natural or artificial lake except as authorized in subsection 2.

2. Subsection 1 shall not be construed to prohibit the use or application of a pesticide in accordance with the federal Insecticide, Fungicide, and Rodenticide Act, 7 U.S.C. §136 et seq. However, an aquatic pesticide shall not be applied to any water of the United States except as authorized in accordance with rules adopted by the commission. [C66, 71, §455B.28; C73, 75, 77, 79, 81, §455B.48] C83, §455B.186 86 Acts, ch 1245, §1899; 90 Acts, ch 1167, §1; 2013 Acts, ch 59, §2 Referred to in §455B.191 \n

Notes of Decisions
Cited in 10 cases, 1994–2017 · leading case: Bd. of Water Works Trs. of the City of Des Moines, Iowa v. Sac Cnty. Bd. of Supervisors, as Tr. of Drainage Districts 32, 42, 65, 79, 81, 83, 86, & Calhoun Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 2 & 51 & Buena Vista Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 19, 890 N.W.2d 50 (Iowa 2017).
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Bd. of Water Works Trs. of the City of Des Moines, Iowa v. Sac Cnty. Bd. of Supervisors, as Tr. of Drainage Districts 32, 42, 65, 79, 81, 83, 86, & Calhoun Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 2 & 51 & Buena Vista Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 19, 890 N.W.2d 50 (Iowa 2017). · cites it 6× “DMWW’s complaint alleges ten causes of action: Count I for violation of various federal statutes known as the Clean Water Act; Count II for violation of Iowa Code section 455B.186 (“A pollutant shall not be disposed of by dumping, depositing, or discharging such pollutant into…”
State Ex Rel. Miller v. DeCoster, 596 N.W.2d 898 (Iowa 1999). · cites it 8× “1 The State points particularly to Code section 455B.186(1). 2 Like the district court, we hold these provisions call for strict liability, and this holding renders some of the factual disputes irrelevant.”
Williams Pipe Line Co. v. Bayer Corp., 964 F. Supp. 1300 (S.D. Iowa 1997). · cites it 4× “Bayer has filed a counterclaim based on state-law claims of strict liability, nuisance, *1307 trespass, negligence, and alleging violation of environmental protection statutes: Iowa Code § 455B.186; the Resource Conservation and Recovery Act of 1976 (“RCRA”), 42 U.”
Blue Chip Enter. v. State Dep't of Nat. Resources, 528 N.W.2d 619 (Iowa 1995). · cites it 10× “It argues that its action in the present case is based upon section 455B.186 (located in Part 1 of Division III dealing with water quality) and thus subject to administrative sanctions specified in section 455B.”
Monroe Branstad v. State of Iowa Ex Rel. Nat. Resource Comm'n & the Iowa Dep't of Nat. Resources, 871 N.W.2d 291 (Iowa 2015). · cites it 2× “As part of this consent order, Branstad admitted that on August 28 and 29, 2008, sweet corn silage leachate, a pollutant, discharged from a containment basin on his farm operation into the Winnebago River in violation of Iowa Code section 455B.186(1). However, Branstad denied…”
Aladdin, Inc. v. Black Hawk Cnty., 562 N.W.2d 608 (Iowa 1997). · cites it 2× “§ 455B.186; see also Blue Chip Enters. v.”
Organic Tech. Corp. v. State Ex Rel. Iowa Dep't of Nat. Resources, 609 N.W.2d 809 (Iowa 2000). · cites it 2× “Iowa Code section 455B.186 as well as Iowa Administrative Code rule 567-64.”
State v. Hunt, 512 N.W.2d 285 (Iowa 1994). “Count I alleged *287 a violation of Iowa Code sections 455B.186(1) and 455B.191(2) for knowingly discharging a pollutant into a waterway of the State between April 17, 1992 and May 14, 1992.”
Bd. of Water Works Trs. of the City of Des Moines, Iowa v. Sac Cnty. Bd. of Supervisors, as Tr. of Drainage Districts 32, 42, 65, 79, 81, 83, 86, & Calhoun Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 2 & 51 & Buena Vista Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 19 (Iowa 2017). · cites it 3× “DMWW’s complaint alleges ten causes of action: Count I for violation of various federal statutes known as the Clean Water Act; Count II for violation of Iowa Code section 455B.186 (“A pollutant shall not be disposed of by dumping, depositing, or discharging such pollutant into…”
Amended April 11, 2017 Bd. of Water Works Trs. of the City of Des Moines, Iowa v. Sac Cnty. Bd. of Supervisors, as Tr. of Drainage Districts 32, 42, 65, 79, 81, 83, 86, & Calhoun Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. of Drainage Districts 2 & 51 & Buena Vista Cnty. Bd. of Supervisors & Sac Cnty. Bd. of Supervisors as Jt. Trs. (Iowa 2017). · cites it 3× “DMWW’s complaint alleges ten causes of action: Count I for violation of various federal statutes known as the Clean Water Act; Count II for violation of Iowa Code section 455B.186 (“A pollutant shall not be disposed of by dumping, depositing, or discharging such pollutant into…”
— Iowa Code § 455B.186(1) — 4 cases
State Ex Rel. Miller v. DeCoster, 596 N.W.2d 898 (Iowa 1999). “1 The State points particularly to Code section 455B.186(1). 2 Like the district court, we hold these provisions call for strict liability, and this holding renders some of the factual disputes irrelevant.”
Monroe Branstad v. State of Iowa Ex Rel. Nat. Resource Comm'n & the Iowa Dep't of Nat. Resources, 871 N.W.2d 291 (Iowa 2015). “As part of this consent order, Branstad admitted that on August 28 and 29, 2008, sweet corn silage leachate, a pollutant, discharged from a containment basin on his farm operation into the Winnebago River in violation of Iowa Code section 455B.186(1). However, Branstad denied…”
Williams Pipe Line Co. v. Bayer Corp., 964 F. Supp. 1300 (S.D. Iowa 1997). “Bayer has filed a counterclaim based on state-law claims of strict liability, nuisance, *1307 trespass, negligence, and alleging violation of environmental protection statutes: Iowa Code § 455B.186; the Resource Conservation and Recovery Act of 1976 (“RCRA”), 42 U.”
State v. Hunt, 512 N.W.2d 285 (Iowa 1994). “Count I alleged *287 a violation of Iowa Code sections 455B.186(1) and 455B.191(2) for knowingly discharging a pollutant into a waterway of the State between April 17, 1992 and May 14, 1992.”
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