HOWELL D350S/D1 COMPRESSOR STATION

Howell D350S/D1 Compressor Station, an upstream natural gas facility classified under NAICS 211130, sits in Archuleta County, New Mexico, and carries a single EPA ECHO registration under FRS ID 110040827905. The ECHO exporter snapshot dated 2026-05-04 records zero quarters-with-noncompliance across the trailing 24 months and an allocated penalty figure of $3,760,000 derived through a five-year-total apportionment formula [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. Zero active permits appear in the current federal dataset. No environmental justice index average is populated for the site [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

The operator is privately held. No SEC CIK is associated with the facility, which means no 10-K or 10-Q filings exist to supply Item 1A forward-looking environmental risk language. That gap is not a technicality. It shapes every analytical step that follows, because the entire evidentiary base must be assembled from federal and state regulatory records rather than from operator-authored disclosure.

The Howell asset name carries documented federal enforcement history that predates the ECHO 24-month window. EPA archived a consent decree naming Anadarko Petroleum Corporation, Howell Corporation, and Howell Petroleum Corporation as respondents [source: https://19january2021snapshot.epa.gov/enforcement/conscent-decree-anadarko-petroleum-corporation-howell-corporation-and-howell-petroleum_.html]. That decree is a pre-acquisition artifact. Drilling records place the Howell D lease in San Juan County, NM under Burlington Resources Oil & Gas Company LP, which operates within the ConocoPhillips corporate structure [source: https://www.drillingedge.com/new-mexico/san-juan-county/leases/howell-d/7124]. The San Juan Basin context matters independently of ownership lineage. New Mexico Environment Department regional haze and NOx four-factor analyses have been applied to comparable compressor-station assets in the same regulatory geography, establishing the air-permit review template that governs facilities of this class [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf].

The ECHO exporter as of 2026-05-04T17:08:04Z reports one facility under the slug howell-d350s-d1-compressor-station, zero violation quarters in the trailing 24 months, and a $3.76 million penalty figure calculated as total_5yr multiplied by (24/60) [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. The zero-quarter violation count means the ECHO Quarterly Noncompliance Report flags were not raised during FY2024 through FY2026 Q1 for FRS ID 110040827905. The penalty allocation, by contrast, reflects prior-period resolved enforcement amortized across the five-year window under ECHO's stated derivation methodology — not a fresh judgment [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

Public-record coverage of the broader Howell and Burlington asset cluster in the San Juan Basin over the past 24 months is thin. No New Mexico state enforcement entries specific to the D350S/D1 site surfaced in available searches. Peer enforcement in the region fills some of that context gap. On September 10, 2021, DCP Operating Company, LP executed a Settlement Agreement and Stipulated Final Compliance Order with the NMED Environmental Protection Division, resolving Case Nos. AQB 20-46 (CO) and AQB 20-64 (CO) — air-quality allegations tied to gas-processing facilities in New Mexico [source: https://www.env.nm.gov/wp-content/uploads/2021/09/2021-09-10-EPD-AQB-DCP-SASFCO-Final.pdf]. That order establishes the procedural model NMED applies when resolving air violations at compressor and processing sites.

Two more recent enforcement data points extend the picture beyond New Mexico. On December 5, 2025, a natural-gas operator was ordered to pay a $500,000 fine plus 500 community-service hours for environmental violations at the Fort Berthold Reservation, signaling an active state-tribal enforcement posture in upstream gas during the review window [source: https://northdakotamonitor.com/briefs/natural-gas-operator-fined-for-environmental-violation-at-north-dakota-reservation/]. On December 19, 2025, Mountain Valley Pipeline advanced its Montgomery County, Virginia compressor station over community opposition, a data point that illustrates permitting friction across the compressor-station asset class broadly [source: https://cardinalnews.org/2025/12/19/then-now-mountain-valley-pipeline-moves-ahead-with-montgomery-county-compressor-station/].

The pre-24-month federal enforcement lineage for Howell-branded entities is documented in the EPA historical snapshot covering Anadarko Petroleum Corporation, Howell Corporation, and Howell Petroleum Corporation, a consent-decree matter resolved under federal environmental statutes [source: https://19january2021snapshot.epa.gov/enforcement/conscent-decree-anadarko-petroleum-corporation-howell-corporation-and-howell-petroleum_.html]. On October 30, 2019, Transwestern Pipeline Company, LLC submitted a four-factor analysis for the Mountainair Compressor Station to NMED Air Quality Bureau under the Clean Air Act Regional Haze Rule, 40 CFR §§51.300–51.309, addressing NOx, SO2, and PM controls for the second regional-haze planning period [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf]. That filing illustrates the air-permit review framework that applies to New Mexico compressor stations of this class. ECHO lists zero active permits for FRS ID 110040827905 in the current exporter, a condition that may reflect a permit reassignment, inactive status, or a reporting lag, and warrants direct confirmation with NMED Air Quality Bureau [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

Trailing 24-month enforcement at the FRS-ID level (110040827905) shows zero violation quarters in the ECHO exporter as of 2026-05-04 [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. The $3,760,000 penalty total in the company record is a pro-rata slice — specifically 24/60 — of a five-year penalty aggregate tied to the FRS ID. It does not correspond to a discrete 24-month judgment or administrative order retrievable in the current public record [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. No program-specific violation entries under CWA, CAA, or RCRA, no single-event penalty amounts, and no consent-order dates within the May 2024 through May 2026 window were located for this facility in the assembled research bundle.

Historical enforcement tied to the Howell corporate name is documented in the EPA archived enforcement page covering Anadarko Petroleum Corporation, Howell Corporation, and Howell Petroleum Corporation, posted on the agency's January 19, 2021 website snapshot [source: https://19january2021snapshot.epa.gov/enforcement/conscent-decree-anadarko-petroleum-corporation-howell-corporation-and-howell-petroleum_.html]. That consent decree is a pre-acquisition artifact. It reflects Anadarko's ownership posture before Burlington Resources Oil & Gas Company LP emerged as the operator of the Howell D lease in San Juan County, NM [source: https://www.drillingedge.com/new-mexico/san-juan-county/leases/howell-d/7124]. The corporate lineage is layered, and the penalty figure in the current ECHO record traces back through that chain.

Peer-class enforcement within NAICS 211130 and the adjacent 211120 code provides a useful benchmark. Red Hills Gas Processing Plant recorded 8 violation quarters and $19,133,219.20 in 24-month penalty allocation across two facilities [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. Greka Bell Compressor Plant posted zero violation quarters but $26,155,942.40 in allocated penalty [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. HP Gas Pad reported 8 violation quarters and $16,134,727.20 [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. Against that peer set, Howell D350S/D1's $3,760,000 allocated 24-month penalty sits roughly one order of magnitude below the top-three penalty-total cohort. Its zero-quarter violation count matches Greka Bell while undercutting Red Hills and HP Gas Pad, each of which hit the ECHO-exporter ceiling of eight quarters [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

Howell D350S/D1 Compressor Station in Archuleta County, NM — the sole facility in the company record under FRS ID 110040827905 — reports zero ECHO violation quarters for the 24-month window, zero active permits listed, and a $3,760,000 allocated penalty derived from five-year totals [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. The EJ index average field is zero-valued. In ECHO, that condition typically signals either a genuine absence of EJSCREEN flags or a data-join gap, not an affirmative finding of low community exposure [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

The broader Howell D lease complex in San Juan County, NM is operated by Burlington Resources Oil & Gas Company LP according to drilling records [source: https://www.drillingedge.com/new-mexico/san-juan-county/leases/howell-d/7124]. San Juan County and adjacent Archuleta County sit within the San Juan Basin. That basin falls under NMED Regional Haze Rule oversight governed by 40 CFR §§51.300 to 51.309 [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf].

The Mountainair Compressor Station, a Transwestern Pipeline Company, LLC asset in New Mexico, submitted its four-factor analysis to NMED Air Quality Bureau on October 30, 2019, addressing NOx, SO2, and PM controls under the second regional-haze planning period [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf]. The regulatory template applied to Mountainair is the same template applicable to Archuleta County compressor stations of similar horsepower class. That parallel is not incidental — it defines the air-permit review exposure that analysts must account for when no facility-level permit data appears in the ECHO record.

On September 10, 2021, DCP Operating Company, LP executed a Settlement Agreement and Stipulated Final Compliance Order under NMED AQB Case Nos. AQB 20-46 (CO) and AQB 20-64 (CO), establishing one documented model for how state air enforcement resolves at compressor and processing sites in New Mexico [source: https://www.env.nm.gov/wp-content/uploads/2021/09/2021-09-10-EPD-AQB-DCP-SASFCO-Final.pdf]. That order's structure — case number, pollutant designation, stipulated compliance schedule — is the procedural form an analyst should expect if NMED were to open a matter at the D350S/D1 site.

Mountain Valley Pipeline's Montgomery County, Virginia compressor station advanced in December 2025 despite community opposition [source: https://cardinalnews.org/2025/12/19/then-now-mountain-valley-pipeline-moves-ahead-with-montgomery-county-compressor-station/]. That out-of-state example is included as a permitting-risk reference for the compressor-station asset class generally, not as a direct analog to the Archuleta facility.

The ECHO exporter returns an empty top_pollutants array for Howell D350S/D1, meaning no TRI or ICIS-Air emissions volumes are populated at the FRS-ID level in the current snapshot [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. Pollutant profiling must therefore draw on the regulatory template applied to comparable New Mexico compressor stations rather than on site-measured data. That is a meaningful limitation. It means the analysis below describes the pollutant exposure profile for the asset class, not confirmed emissions from this specific facility.

Nitrogen oxides are the principal pollutant of concern for reciprocating-engine and turbine-driven natural-gas compressor stations. The NMED four-factor analysis for Transwestern's Mountainair Compressor Station was prepared under the Clean Air Act Regional Haze Rule, 40 CFR §§51.300 to 51.309 — a program that exists because NOx emissions from stationary combustion sources contribute to regional visibility impairment in Class I areas and to ozone formation downwind [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf]. Exposure pathways include direct inhalation of NO2 with respiratory-tract effects and secondary ozone formation affecting populations dozens of miles from the source.

Volatile organic compounds and methane are co-emitted at gas-processing and compression sites through fugitive leaks from valves, flanges, and seals. Small. Persistent. Difficult to quantify without continuous monitoring. The DCP Operating Company NMED stipulated compliance order of September 10, 2021 addressed air-quality allegations at that operator's New Mexico gas-processing sites, reflecting the regulatory attention paid to VOC and fugitive emissions across the compressor-and-processing asset class [source: https://www.env.nm.gov/wp-content/uploads/2021/09/2021-09-10-EPD-AQB-DCP-SASFCO-Final.pdf].

Particulate matter — specifically PM2.5 from combustion-engine exhaust — is the third pollutant class typically assessed in four-factor analyses of compressor stations under regional-haze review [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf]. EJ implications for Archuleta County are not quantified in the ECHO record for FRS 110040827905, where ej_index_avg reads 0.0 [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. That zero value does not rule out nearby tribal or rural-community exposure. The San Juan Basin's proximity to the Southern Ute and Jicarilla Apache jurisdictions makes the absence of EJSCREEN indexing a data gap worth flagging, not a clearance.

Within the NAICS 211120 and 211130 upstream-gas peer frame, Howell D350S/D1 Compressor Station's $3,760,000 allocated 24-month penalty is roughly one-seventh of Greka Bell Compressor Plant's $26,155,942.40, one-fifth of Red Hills Gas Processing Plant's $19,133,219.20, and one-fourth of HP Gas Pad's $16,134,727.20 [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. The spread is not trivial. Greka Bell's penalty total alone is nearly seven times larger despite also recording zero violation quarters — a divergence that illustrates how the ECHO apportionment formula can produce large dollar figures independent of recent QNCR flag activity. On violation-quarter count, Howell D350S/D1 matches Greka Bell at zero and sits below Red Hills and HP Gas Pad, each of which reached eight — the ECHO-exporter ceiling value for the 24-month QNCR measurement [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip]. EJ index averages across all four peers are reported as 0.0 in the current exporter. That uniformity most likely reflects EJSCREEN join-layer gaps rather than affirmative low-exposure findings, and should not be read as evidence of minimal community impact at any of these sites [source: https://echo.epa.gov/files/echodownloads/echo_exporter.zip].

No SEC Item 1A disclosure is available for Howell D350S/D1 Compressor Station because the operator is privately held and carries no CIK on file. The 10-K and 10-Q research bundles returned empty objects. Forward-looking environmental risk for this asset must accordingly be inferred from the NMED regulatory template applicable to San Juan Basin compressor stations. That template centers on the Regional Haze Rule second-planning-period four-factor framework, which governs NOx, SO2, and PM controls at stationary combustion sources under 40 CFR §§51.300 to 51.309 [source: https://www.env.nm.gov/wp-content/uploads/sites/2/2019/12/AI_1569_11203587-RPT-Mountainair_Four-Factor_FINAL.pdf]. The precedent of NMED Air Quality Bureau stipulated compliance orders against peer operators — including DCP Operating Company's September 10, 2021 order covering AQB 20-46 and AQB 20-64 — defines the enforcement pathway most likely to materialize if air-quality obligations at the D350S/D1 site are not maintained [source: https://www.env.nm.gov/wp-content/uploads/2021/09/2021-09-10-EPD-AQB-DCP-SASFCO-Final.pdf]. The zero active-permit count in the current ECHO record adds a discrete near-term risk: if the facility is operating without a current air permit on file with NMED, that condition alone can trigger a compliance inquiry independent of any measured emissions exceedance.