EPA Orders Northern Arapaho Utilities to Fix Failed Wastewater Lagoon
Federal regulators found the Mill Creek Wastewater Treatment Lagoon on the Wind River Reservation in disrepair, with overgrown vegetation, broken valves, and missing maintenance records that threatened to discharge untreated sewage into tribal waterways.
The EPA ordered Northern Arapaho Utilities to fix serious problems at its Mill Creek Wastewater Treatment Lagoon after a 2021 inspection found overgrown vegetation threatening lagoon integrity, a broken valve connecting treatment cells, and missing operations manuals. The facility discharges into waterways that feed the Wind River, putting tribal communities at risk of sewage contamination. The utility must now implement proper maintenance procedures, remove vegetation, fix the valve, and provide regular reports to federal regulators.
When basic infrastructure fails on tribal lands, communities pay the price with their health and environment.
The Allegations: A Breakdown
| 01 | Northern Arapaho Utilities failed to address overgrown vegetation and trees at the Mill Creek Wastewater Treatment Lagoon, violating permit requirements designed to protect lagoon infrastructure from damage that could lead to leaks or treatment failures. | high |
| 02 | The utility failed to fix or replace a valve connecting treatment cells 1 and 2, even though this valve controls how wastewater flows through treatment stages and its failure could cause untreated sewage to bypass treatment. | high |
| 03 | The facility kept no copy of required operations and maintenance manuals or records of maintenance operations, leaving workers without standardized procedures to ensure safe wastewater treatment. | high |
| 04 | EPA inspectors discovered these violations during a June 30, 2021 inspection of the facility, which discharges into the Hansen Drain that feeds into the Mill Creek Drain, Little Wind River, and ultimately the Wind River. | medium |
| 05 | The utility operates under federal permits that require weekly facility inspections and maintenance logs, but allegedly failed to properly conduct or document these inspections. | medium |
| 06 | A technical assistance provider later helped develop operations and maintenance manuals for the facility, but the consent order notes these manuals have not been implemented fully. | medium |
| 01 | The EPA implements the NPDES pollution discharge program on the Wind River Reservation because no other governmental entity has been approved to enforce Clean Water Act protections there. | medium |
| 02 | The facility’s 2016 permit expired on December 31, 2020 but was administratively continued, creating an extended interim period during which compliance drifted without rigorous oversight. | medium |
| 03 | EPA did not issue a new permit until November 21, 2022, leaving nearly two years when the facility operated under an expired permit that was merely continued administratively. | medium |
| 04 | The 2021 inspection that discovered these violations occurred under the expired but administratively continued 2016 permit, highlighting how permit renewal delays can enable noncompliance. | medium |
| 05 | Both the 2016 and 2022 permits required the utility to properly operate and maintain all treatment facilities and conduct weekly inspections, yet these basic requirements went unenforced for years. | high |
| 06 | The consent order threatens civil penalties of up to $66,712 per day for each violation, but notes this does not constitute a waiver of EPA’s right to seek additional penalties or criminal action. | medium |
| 01 | Northern Arapaho Utilities allegedly deferred basic maintenance tasks like removing vegetation and fixing valves, prioritizing immediate budget constraints over long-term infrastructure integrity and environmental protection. | high |
| 02 | The utility allegedly kept no operations and maintenance manual on site, meaning workers had no standardized procedures to follow and managers saved money on documentation and training at the expense of treatment quality. | high |
| 03 | A broken valve connecting two treatment cells remained unrepaired, suggesting the utility chose to defer a costly fix rather than ensure wastewater moved properly through all treatment stages. | high |
| 04 | The consent order notes that since the 2021 inspection, the utility provided logs showing weekly inspections are now being conducted, indicating it took federal enforcement action to compel basic compliance. | medium |
| 05 | A technical assistance provider had to help the utility develop operations and maintenance manuals, revealing the organization lacked internal capacity or willingness to create these essential documents on its own. | medium |
| 06 | Even after manuals were developed with outside help, the consent order states they have not been implemented fully, showing the utility continued to resist adopting proper maintenance protocols. | high |
| 01 | The Mill Creek Wastewater Treatment Lagoon sits in the Town of Ethete on the Wind River Reservation, meaning any discharge violations directly threaten the Northern Arapaho Tribe’s lands and waterways. | high |
| 02 | The facility discharges into the Hansen Drain, which flows into the Mill Creek Drain, then the Little Wind River, and finally the Wind River, putting an entire watershed chain at risk of sewage contamination. | high |
| 03 | The Northern Arapaho Tribe is a federally recognized Indian tribe, and the utility is an Indian tribal organization, yet tribal members faced environmental risks from inadequate wastewater treatment on their own reservation. | high |
| 04 | Tribal communities often rely on local waterways for cultural practices, subsistence fishing, and recreation, making any threat to water quality especially harmful to their way of life. | medium |
| 05 | The consent order identifies the Wind River as a traditional navigable water protected under the Clean Water Act, underscoring that pollution from this lagoon threatens federally protected waters used by tribal and non-tribal communities alike. | medium |
| 06 | With overgrown vegetation threatening lagoon integrity and a broken valve potentially allowing untreated sewage to bypass treatment, nearby residents faced ongoing risk of waterborne pathogens and pollution. | high |
| 01 | Overgrown vegetation and trees at the lagoon can compromise lagoon liners, affect flow and treatment efficiency, and allow animals or insects to proliferate in ways that degrade water quality and spread disease. | high |
| 02 | A failed valve connecting treatment cells can stall or disrupt wastewater treatment, leading to higher concentrations of pollutants including sewage, chemical wastes, and biological materials in the final discharge. | high |
| 03 | The Clean Water Act defines pollutants to include sewage, chemical wastes, biological materials, and municipal waste discharged into water, all of which can harm human health when treatment systems fail. | high |
| 04 | Improperly treated wastewater can contaminate drinking water sources, cause nutrient overload leading to harmful algal blooms, and expose communities to pathogens that cause waterborne illnesses. | high |
| 05 | Without proper operations and maintenance manuals, workers had no standardized procedures to prevent accidents, injuries, or exposure to pathogens at the wastewater facility. | medium |
| 06 | Children, seniors, and people with compromised immune systems face the greatest risk from waterborne pathogens or toxins that might appear if the lagoon system malfunctions. | high |
| 01 | In signing the consent order, Northern Arapaho Utilities neither admits nor denies the findings of permit violations, allowing the entity to avoid acknowledging wrongdoing while agreeing to comply. | medium |
| 02 | The consent order explicitly states it does not constitute a waiver of EPA’s right to seek civil penalties, fines, or criminal action, meaning the utility may still face financial consequences beyond this agreement. | medium |
| 03 | The utility waived any and all remedies, claims for relief, and rights to judicial or administrative review, preventing future legal challenges to the consent order or the underlying violations. | medium |
| 04 | Any failure to comply with the consent order’s requirements will constitute a new violation subjecting the utility to penalties of up to $66,712 per day per violation under Clean Water Act section 309. | high |
| 05 | The consent order requires reports and certifications to be signed by a ranking elected official who certifies under penalty of law that information is true and accurate, with potential fines or imprisonment for false statements. | medium |
| 06 | The order notes that compliance with its terms does not relieve the utility of obligations to comply with any other federal, state, tribal, or local environmental laws or regulations. | medium |
| 07 | Section 309 of the Clean Water Act authorizes fines and imprisonment for willful or negligent violations, yet the consent order does not pursue criminal charges despite years of alleged noncompliance. | medium |
| 01 | Without an operations and maintenance manual on site, workers at the Mill Creek lagoon had no standardized reference for carrying out safe, effective wastewater treatment procedures. | high |
| 02 | The absence of maintenance operation records meant workers could not track what repairs were needed or what had already been done, creating chaotic conditions that increase accident risk. | medium |
| 03 | A broken valve and overgrown vegetation left unaddressed for years suggest workers were either not trained to identify these hazards or were not given resources to fix them, endangering their safety. | medium |
| 04 | The consent order requires the utility to implement operations and maintenance manuals immediately, acknowledging that workers have been operating without proper procedural guidance. | medium |
| 01 | EPA inspectors documented serious violations including overgrown vegetation, broken valves, and missing manuals during a June 30, 2021 inspection, yet the consent order was not filed until September 25, 2024, more than three years later. | high |
| 02 | The utility’s 2016 permit expired on December 31, 2020 but was administratively continued until a new permit was issued on November 21, 2022, creating a nearly two-year gap with reduced oversight. | medium |
| 03 | Even after technical assistance providers helped develop operations and maintenance manuals, the consent order notes these have not been fully implemented, showing the utility continued delaying actual compliance. | high |
| 04 | The consent order gives the utility three months to remove vegetation and fix the valve, and six months to provide an operations and maintenance summary, extending timelines further despite years of known violations. | medium |
| 05 | The order specifies that if any deadline falls on a weekend or federal holiday, the relevant deadline becomes the first business day following that date, potentially adding further delays. | low |
| 01 | Northern Arapaho Utilities must now implement operations and maintenance manuals immediately, remove overgrown vegetation within three months, and fix the broken valve within three months under federal oversight. | high |
| 02 | The utility must provide EPA with photos showing corrective actions have been completed, dates when work was finished, and a six-month summary of all maintenance performed at the facility. | medium |
| 03 | The consent order became effective immediately upon receipt by the utility, binding them to comply with all terms under threat of civil penalties up to $66,712 per day for each violation. | high |
| 04 | This case exemplifies how even basic wastewater infrastructure can deteriorate when entities defer maintenance, lack proper documentation, and operate without consistent regulatory oversight. | high |
| 05 | Tribal communities on the Wind River Reservation faced years of environmental risk from a facility that allegedly violated Clean Water Act permits designed to protect their waterways and public health. | high |
| 06 | The pattern of violations including overgrown vegetation, broken infrastructure, and missing manuals mirrors failures seen across industries where immediate costs are prioritized over long-term environmental stewardship. | medium |
Timeline of Events
Direct Quotes from the Legal Record
“Respondent failed to address overgrown vegetation and trees at the Facility as required by part 6.5 of the 2016 Permit.”
💡 Overgrown vegetation can compromise lagoon liners, affect treatment efficiency, and allow animals or insects to proliferate, degrading water quality.
“Respondent failed to fix or replace a valve connecting cells 1 and 2 as required by part 6.5 of the 2016 Permit.”
💡 Valves control how wastewater flows through treatment stages, and a failed valve can stall treatment or allow higher pollutant concentrations in discharge.
“Respondent failed to keep a copy of the O&M manual as well as records of maintenance operations for the Facility.”
💡 Without maintenance manuals and records, workers have no standardized procedures and managers cannot ensure consistent, safe operations.
“A technical assistance provider helped the Respondent develop O&M manuals for the Facility, including an O&M manual for the lift station; however, the O&M manuals have not been implemented fully.”
💡 Even with outside help creating proper procedures, the utility continued to resist actually following them.
“The Facility discharges to the Hansen Drain, which is a relatively permanent tributary of the Mill Creek Drain. The Mill Creek Drain is a relatively permanent tributary of the Little Wind River. The Little Wind River is a relatively permanent tributary of the Wind River, which is a traditional navigable water.”
💡 Pollution from this lagoon directly threatens a chain of waterways protected under the Clean Water Act.
“The Act defines ‘pollutant’ to include ‘sewage . . . chemical wastes, biological materials . . . and industrial, municipal, and agricultural waste discharged into water.'”
💡 The lagoon treats exactly these types of pollutants, and failures allow them to enter waterways.
“In signing this Consent Order, Respondent neither admits nor denies the Findings in paragraphs 17 through 29, above. Without any admission of liability, Respondent consents to the issuance of this Consent Order and agrees to abide by all of its conditions.”
💡 The utility avoids acknowledging wrongdoing while agreeing to comply, a common tactic to limit legal liability.
“Respondent waives any and all remedies, claims for relief, and otherwise available rights to judicial or administrative review that Respondent may have with respect to any issue of fact or law set forth in this Consent Order.”
💡 By waiving judicial review rights, the utility cannot later challenge the violations in court.
“This Consent Order does not constitute a waiver or election by the EPA to forego any civil or criminal action to seek penalties, fines, or other relief as it may deem appropriate under the Act.”
💡 The consent order does not prevent EPA from pursuing additional financial or criminal penalties for these violations.
“Section 309(d) of the Act, 33 U.S.C. § 1319(d), authorizes civil penalties of up to $66,712 (as adjusted for inflation by 40 C.F.R. part 19) per day for each violation of the Act.”
💡 Each day of noncompliance could result in massive financial penalties, creating a strong incentive for compliance.
“Section 309(c) of the Act, 33 U.S.C. § 1319(c), authorizes fines and imprisonment for willful or negligent violations of the Act.”
💡 Beyond civil fines, individuals responsible for violations can face criminal prosecution including jail time.
“Within three months from the effective date of this Consent Order, remove overgrown vegetation and trees in accordance with part 6.6 of the 2022 Permit. Provide the EPA with the date the overgrown vegetation was removed from the lagoon dikes and photos showing corrective actions have been completed.”
💡 The utility must complete basic maintenance and document it within three months under federal oversight.
“Within three months from the effective date of this Consent Order, fix or replace the valve connecting cells 1 and 2, and provide EPA with photos showing corrective actions have been taken.”
💡 Years after inspectors found the broken valve, the utility must finally repair it within 90 days.
“On the effective date of this Consent Order, implement the O&M manuals and schedules for the Facility, including the conveyance system, in accordance with part 6.6 of the 2022 Permit.”
💡 Despite having manuals developed with outside help, the utility must now actually use them starting immediately.
“Provided logs indicating that weekly inspections are now being conducted at the facility as required by parts 4.3 of the 2016 Permit.”
💡 It took federal enforcement action to compel the utility to conduct basic weekly inspections required by their permit.
Frequently Asked Questions
EPA did this in 2024: https://yosemite.epa.gov/oa/rhc/epaadmin.nsf/Filings/1D97AB5B0E00974185258BAC0073AD60/$File/CWA-08-2024-0022%20Beaver%20Creek%20Lagoon%20AOC.pdf
and then in 2020 lmao: https://yosemite.epa.gov/OA/RHC/EPAAdmin.nsf/Filings/4ED8380BEEF232508525868D005864A8/$File/SDWA-08-2021-0002%20AOC.pdf
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