Utilities
What’s in Your Water Law? Not Much.
How Did We Get Here?: What is Happening in Louisiana
The Mississippi River is one of the most important commercial waterways in the world, carrying 500 million tons of shipped goods per year ranging from petroleum products, iron, and steel to coffee and paper.[1] The river is often treated as just a commercial waterway rather than what it is—a vital part of a complex ecosystem and source of water to millions. To accommodate larger vessels that use the expanded Panama Canal, Louisiana Governor John Bel Edwards authorized the dredging of the river to deepen it from forty-five feet to fifty feet in 2020.[2] The Governor’s Office projected that every additional foot of depth will allow an additional $1 million in cargo transportation on the river.[3] The U.S. Army Corps of Engineers completed a supplemental environmental impact statement to assess the impact of the project pursuant to the National Environmental Policy Act (NEPA).[4] The study had significant findings on the potential risks for drinking water.
The Mississippi River spans over 2,000 miles, from Minnesota to the Gulf of Mexico, and supplies more than fifty municipalities—around twenty million people—with drinking water.[5] The bed of the river is lower than sea-level.[6] This, coupled with the fact that salt water is denser than freshwater, causes salt water to push upstream underneath the fresh water in the shape of a “wedge” or a doorstop when the flow of the river is weakened.[7] The water flow must be 300,000 cubic feet per second to keep the salt water from flowing upstream.[8] During times of drought, the flow rate of the river may drop below 300,000 cubic feet per second, allowing salt water to travel further and further upstream, increasing the salinity of the river and thus the drinking water.[9] By deepening the river, the difference between the bed of the river and sea-level increased, and so did the risk of saltwater intrusion: an outcome acknowledged by the Army Corps itself.[10] The environmental impact study found that deepening the river would “increase . . . the duration and extent of the [sic] saltwater intrusion that occurs during annual low water events.”[11] Another significant factor in the greater frequency of saltwater intrusion is the rising sea level as a result of the climate crisis.[12] Experts believe the threat of salt water reaching other major cities is growing, particularly in Louisiana, Florida, California, and the Northeast.[13] While engineering is not the only factor increasing the risk of saltwater intrusion, it is arguably the factor most easily changed.
After the river was deepened to forty-five feet in 1987, saltwater intrusion occurred approximately once a decade—in 1988, 1999, 2012, and 2022—until now.[14] For the first time, the river is experiencing a second year in a row of saltwater intrusion and it is taking longer to recover from consecutive years of low water events.[15] To mitigate the duration and extent of the saltwater intrusion, the Army Corps has built a “sill” to reduce saltwater flow during low water events.[16] A sill is essentially an underwater levee or wall of dirt that “kicks up” the front of the saltwater wedge, pushing the denser salt water up and into the flow of freshwater and increasing the likelihood that the salt water will be pushed back down the river.[17] The sill cannot stop the salt water from moving up the river indefinitely, but it can buy some time until there is more rain or the water flow increases.[18] While the sill is an effective temporary solution, it is not an easy feat. The U.S. Coast Guard and navigation industry must temporarily block river traffic to allow for the sill’s construction, and its construction is estimated to cost $1.2 million per year if constructed once every five years.[19] Because of the severity of this year’s saltwater intrusion, the sill was raised from -55 feet to -30 feet with a notch of -55 feet to allow vessels needing the depth to continue navigating the river with one-way traffic rules.[20] The sill is a bandage over a larger problem. Salt water may still move past the sill and many water treatment systems in Louisiana, including New Orleans, are not equipped with desalination units.[21] Worse yet, the salt water is capable of corroding the pipes of the current water treatment systems and allowing far more dangerous contaminants than salt to infiltrate the water supply.[22] This problem looks dangerously similar to what occurred in Flint, Michigan.[23] Another concern is the particularly toxic byproducts produced by the disinfectant process used for treating seawater.[24] Seawater produces more byproducts because it requires more disinfectant than fresh water, in part because of different contaminants found in seawater.[25] One such contaminant is bromoform, a primary contaminant created in the disinfecting process of bromide, which is found in seawater.[26] In a recent test of drinking water in the lower Plaquemines parish, bromoform levels were more than one hundred times that of typical drinking water and well above EPA’s limits.[27]
How the Law Protects Drinking Water
President Ford signed the Safe Drinking Water Act (SDWA) in 1974 with the goal of regulating the public drinking water supply.[28] The statute charges EPA with identifying and setting standards for drinking water to protect public health.[29] The responsibility for satisfying the SDWA standards is divided among EPA, tribes, states, water systems, and the public.[30] EPA grants “primacy” or delegates its authority to states and territories that enforce the regulations it sets.[31] All states except Wyoming and the District of Columbia have primacy, largely because most states prefer to exercise this power rather than allow the federal government to govern the treatment of the state’s water.[32] EPA has set limits for primary and secondary contaminants. Primary contaminant standards are health based and legally enforceable.[33] These standards address contaminants, such as lead and mercury, with significant health consequences.[34] Secondary contaminant standards address the appearance or taste of the water and are not legally enforceable.[35] Secondary contaminants include zinc, “odor,” and chloride (the negative ion of salt when it is placed in water).[36] EPA’s maximum contaminant level for chloride is 250 milligrams per liter.[37] There are no legal consequences for failing to keep chloride levels in drinking water below this amount, but it is harmful to some populations such as pregnant women, infants, and individuals on a low-sodium diet, such as those with kidney disease or heart conditions.[38]
Despite the lack of legal ramifications for secondary contaminants like chloride, there is still a political interest in maintaining EPA standards for drinking water because of the potential effect on constituents and the potential for backlash from those constituents at the polls. The Governor of Louisiana and President Biden declared a state of emergency authorizing the Governor to use emergency powers and allowing Louisiana to receive Federal assistance to address the drought and saltwater intrusion.[39] The response to the saltwater intrusion has been extensive. As of October 20, 2023, the saltwater wedge was at River Mile 65.8, and the salinity of the water fifteen to twenty-five miles downstream of the wedge toe is not compliant with EPA standards for chloride.[40] Louisiana has built pipelines to bring in fresh water, barged fresh water further upriver, installed desalination equipment, and constructed the sill.[41] Prior to declaring a state of emergency, Plaquemines Parish, which has a population of approximately 22,500 people,[42] relied on bottled water for bathing, cooking, and drinking since June.[43] According to the parish, its drinking water has been within EPA standards since October 1, 2023 due to freshwater barging and blending techniques.[44]
What is Next for Our Water?
The saltwater wedge has begun to regress downriver as a result of increased water flow following rainfall and the construction of the sill.[45] Current predictions no longer foresee a worst-case scenario occurring, but the truth remains that it could occur at some point in the future—and we are aware of the threat.[46]
The current response to water crises like the saltwater intrusion is reactive rather than proactive. The SDWA requires that, in return for primacy, states must have “adopted and can implement an adequate plan for the provision of safe drinking water under emergency circumstances including earthquakes, floods, hurricanes, and other natural disasters.”[47] Part of this requirement should include forward-looking planning, not only to ensure the provision of safe drinking water during predictable emergencies, but also to prevent or mitigate the impact of such emergencies. Authorities knew that the dredging of the Mississippi River would increase the likelihood of saltwater intrusion and that such emergencies occur with predictable frequency and are only becoming more frequent. Louisiana communities have a right to safe drinking water and should have the legal protection to ensure it. That requires more than standards set out by the EPA. It requires legal obligations of the government to make decisions in line with the health of the community and the environment that provides for them.
Paul Sarahan is a partner at Earth & Water Law. He focuses his practice on environmental, safety, and transportation issues. He has 28 years of experience in policy, regulation, and commercial use of the environment and has represented clients in the energy, chemical, manufacturing, transportation, and retail industry sectors before federal, state, and local agencies. Paul is a graduate of the University of Texas at Austin, The University of Texas School of Law, and the University of Houston Law Center’s Energy, Environmental and Natural Resources LL.M. program.
Nikiya Mellon is a 3L from Fort Worth, Texas. She attended the University of North Texas and joined TELJ during her second year of law school.
[1] Mississippi River Facts, Nat’l Park Serv., https://www.nps.gov/miss/riverfacts.htm (last updated Feb. 10, 2022).
[2] Mississippi River Deepening from 45 to 50 Feet Authorized, State of Louisiana Office of the Governor (July 31, 2020) https://gov.louisiana.gov/index.cfm/newsroom/detail/2618.
[3] Id.
[4] See U.S. Army Corps of Eng’rs, Integrated General Reevaluation Report & Supplement III to the Final Environmental Impact Statement, Mississippi River Ship Channel, Baton Rouge to the Gulf, Louisiana Project iii (2018).
[5] Mississippi River Facts, supra note 1; Moira McDonald, River at Risk: The Mississippi, Walton Fam. Found. (Feb. 9, 2017), https://www.waltonfamilyfoundation.org/stories/k-12-education/river-at-risk-the-mississippi.
[6] An Overview of the Mississippi River’s Saltwater Wedge, U.S. Army Corps of Eng’rs, https://www.mvn.usace.army.mil/Missions/Engineering/Stage-and-Hydrologic-Data/SaltwaterWedge/SaltwaterWedgeOverview/ (last visited Nov. 17, 2023).
[7] Id.
[8] 5 Things to Know About the Saltwater Intrusion of the Mississippi River, Tul. Univ. Sch. of Pub. Health & Tropical Med., https://sph.tulane.edu/5-things-know-about-saltwater-intrusion-mississippi-river (last updated Sept. 28, 2023).
[9] Lower Mississippi Saltwater Intrusion, City of New Orleans Office of Homeland Sec. and Emergency Preparedness, https://ready.nola.gov/incident/saltwater-intrusion/about-saltwater-intrusion/ (last visited Nov. 17, 2023).
[10] Integrated General Reevaluation Report & Supplement, supra note 5, at 2-23.
[11] Id.
[12] Delaney Nolan, Saltwater Threat to Louisiana Drinking Water to Grow Across US, Experts Warn, The Guardian (Oct. 10, 2023), https://www.theguardian.com/us-news/2023/oct/10/louisiana-drinking-water-saltwater-mississippi-river.
[13] Id.
[14] Roby Chavez, Why the Saltwater Wedge Climbing Up the Mississippi River is a Wake-Up Call to the Region, PBS, https://www.pbs.org/newshour/nation/why-salt-water-is-threatening-drinking-water-in-new-orleans-and-what-officials-are-doing-about-it; see also Integrated General Reevaluation Report & Supplement, supra note 5, at 2-24.
[15] Chavez, supra note 15.
[16] Integrated General Reevaluation Report & Supplement, supra note 5, at 3-6.
[17] 5 Things to Know About the Saltwater Intrusion of the Mississippi River, supra note 9.
[18] Id.
[19] Integrated General Reevaluation Report & Supplement, supra note 5, at 3–22.
[20] 5 Things to Know About the Saltwater Intrusion of the Mississippi River, supra note 9; Press Release, Ricky Boyett, Latest Saltwater Wedge Forecast Released by USACE, U.S. Army Corp of Eng’rs (Oct. 12, 2023), https://gohsep.la.gov/Portals/3/Docs/Intrusion/Latest%20saltwater%20wedge%20forecast%20released%20by%20USACE.pdf.
[21] 5 Things to Know About the Saltwater Intrusion of the Mississippi River, supra note 9.
[22] Chavez, supra note 15.
[23] Kristi Pullen Fedinick et al., Watered Down Justice 9 (2019), https://www.nrdc.org/sites/default/files/watered-down-justice-report.pdf.
[24] Delaney Nolan, ‘These Levels Are Crazy’: Louisiana Tap Water Sees Huge Spike in Toxic Chemicals, The Guardian (Oct. 27, 2023), https://www.theguardian.com/us-news/2023/oct/27/louisiana-mississippi-river-tap-water-contamination-chemicals.
[25] Id.
[26] Id.
[27] Id.
[28] Env’t Prot. Agency, Understanding the Safe Drinking Water Act (2004), https://www.epa.gov/sites/default/files/2015-04/documents/epa816f04030.pdf.
[29] Fedinick et al., supra note 24, at 10.
[30] Understanding the Safe Drinking Water Act, supra note 29.
[31] Fedinick et al., supra note 24, at 30.
[32] Arthur Holst & Jennifer Stonecipher, Safe Drinking Water Act of 1974, Ctr. for the Study of Federalism, https://encyclopedia.federalism.org/index.php/Safe_Drinking_Water_Act_of_1974#:~:text=A%20state%20can%20apply%20for,stricter%2C%20standards%20than%20the%20EPA (last updated Aug. 2018).
[33] National Primary Drinking Water Regulations, U.S. Env’t Prot. Agency, https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations (last updated Jan. 9, 2023).
[34] Id.
[35] Secondary Drinking Water Standards: Guidance for Nuisance Chemicals, U.S. Env’t Prot. Agency, https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals (last updated Feb. 14, 2023).
[36] Id.; Water Sci. Sch., Water Molecules and Their Interaction with Salt, U.S. Geological Surv., https://www.usgs.gov/media/images/water-molecules-and-their-interaction-salt (last visited Nov. 17, 2023).
[37] Secondary Drinking Water Standards, supra note 36.
[38] Community Preparedness and Health Protection, La. Dep’t of Health, https://ldh.la.gov/page/4595#:~:text=Water%20that%20has%20exceeded%20250,to%20mix%20with%20baby%20formula (last visited Nov. 17, 2023).
[39] President Joseph R. Biden, Jr. Approves Louisiana Emergency Declaration, The White House (Sept. 27, 2023), https://www.whitehouse.gov/briefing-room/presidential-actions/2023/09/27/president-joseph-r-biden-jr-approves-louisiana-emergency-declaration-4/#:~:text=Today%2C%20President%20Joseph%20R.%20Biden,20%2C%202023%2C%20and%20continuing.; https://gov.louisiana.gov/assets/141JBE2023.pdf.
[40] Where is the Saltwater Wedge Now?, U.S. Army Corps of Eng’rs (Oct. 22, 2023), https://www.mvn.usace.army.mil/Missions/Engineering/Stage-and-Hydrologic-Data/SaltwaterWedge/SaltwaterWedgeNow/.
[41] Chavez, supra note 15.
[42] QuickFacts: Plaquemines Parish, Louisiana, U.S. Census Bureau, https://www.census.gov/quickfacts/fact/table/plaqueminesparishlouisiana/PST045222 (last updated July 1, 2022).
[43] Chavez, supra note 15.
[44] Saltwater Intrusion Updates, Plaquemines Parish, https://www.plaqueminesparish.com/CivicAlerts.aspx?AID=477 (last updated Nov. 2, 2023).
[45] Press Release, supra note 21.
[46] Chavez, supra note 15.
[47] 42 U.S.C. § 300g-2 (2018).