What Hazco Environmental does

Hazco Environmental, now operating as Denholm Environmental following its October 2021 merger into Denholm MacNamee, is a UK-based specialist industrial services provider headquartered in Inverurie, Scotland, and part of the Denholm Energy Services group. The company delivers hazardous-environment cleaning, chemical and NORM decontamination, high-pressure and ultra-high-pressure water jetting (up to 60,000 psi), dry ice cleaning, vacuum transfer, and liquid waste management services to oil and gas operators (FPSOs, platforms, refineries, terminals), petrochemical, utilities, manufacturing, marine, and broader energy customers across the UK, Norway, West Africa and South America. Service delivery is anchored by proprietary technology including the Premier Transfer System (PTS) closed-loop vacuum unit with a 100% waste-removal success rate across more than 20 years and an exclusive UK licence for the Zyme-Flow chemical decontamination process, supported by what the company describes as one of the largest HP/UHP jetting fleets in Western Europe with 40 pumps acquired over the past 10 years, alongside an integrated equipment hire catalogue (DNV 2.7-1, ATEX and NORSOK certified).

The commercial model is project-based and quote-driven for specialist industrial services with multi-year contracts available for larger enterprise customers, supplemented by an equipment hire revenue stream from the owned fleet (jetting units, vacuum units, hot wash units, pumps, tank sweep systems, and ancillary tools). Go-to-market is direct enterprise field sales targeting named oil and gas, petrochemical and industrial majors, supported by industry events, the FPAL supplier verification track record, and referrals generated through critical-supplier status with multiple FPSO owners. Headcount, revenue and unit economics are not publicly disclosed; the company is a private subsidiary of the diversified Denholm Energy Services conglomerate and holds ISO 9001, 14001 and 45001 certifications alongside Cyber Essentials, SSIP and SafeContractor accreditations, with additional sister entities in Kazakhstan (Denholm Zholdas), UAE (Denholm Yam), Relay Engineering Group, and Petrasco operating within the same group portfolio.

Name

Hazco Environmental

Legal name

Denholm Environmental Limited

Website

https://denholm-enviro.com

Company type

Private

Founded year

1970

Operating status

Operating

Short description

Hazco Environmental (now Denholm Environmental) is a UK-based specialist industrial services provider delivering hazardous-environment cleaning, decontamination, jetting and waste management to oil and gas, petrochemical, marine and energy operators across the UK, Norway, West Africa and South America.

Ownership category

akta.pro rank

Product category

Industrial Cleaning Services

NAICS

Hazardous Waste Treatment and Disposal (562211), Remediation Services (562910), Remediation and Other Waste Management Services (5629)

SIC

Hazardous Waste Management (4955), Refuse Systems (4953)

akta.pro primary industry

Chemical Tank Cleaning, Decontamination & Turnaround Waste Services (BPALAHAH)

akta.pro secondary industries

Hazardous Materials (HazMat) Spill Response & Remediation (Emergency, Decontamination) (EUAIAFAJ), Spill Response, Decontamination & Emergency Hazmat Services (TLAIAJAK), Hazmat Waste & Hazardous Remediation Haulage (regulated waste streams) (TLADAIAJ)

Keywords

• Industrial cleaning services
• High pressure water jetting
• Tank cleaning solutions
• Hazardous waste management
• Oilfield services

Headquarters

HQ city

Inverurie

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Specialist Industrial Services: Provides comprehensive industrial services including oilfield services, water jetting, liquid waste management, and equipment hire to clients across oil & gas, petrochemicals, utilities, manufacturing, marine and energy sectors. Revenue generated through project-based service delivery for both onshore and offshore operations.
2. Equipment Hire: Extensive fleet of high pressure and ultra-high-pressure jetting equipment, vacuum units, and specialized industrial equipment available for hire to external clients. Equipment includes jetting units, hot wash units, vacuum transfer systems, and various pumps and accessories.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Hazco Environmental (now operating as Denholm Environmental) provides specialist industrial cleaning, decontamination, and waste management services to oil & gas, petrochemical, utilities, manufacturing, marine and energy sectors. Core services include tank cleaning, NORM decontamination, chemical decontamination (Zyme-Flow), high-pressure/ultra-high-pressure water jetting, dry ice cleaning, process plant and pipework cleaning, and liquid waste management. The company also hires out specialized industrial equipment including jetting units, vacuum systems, pumps and tank sweep packages for onshore and offshore operations.

Product overview

Denholm Environmental (formerly Hazco Environmental) provides specialist industrial services through an integrated portfolio of service categories and equipment hire. The core offering includes Oilfield Services (chemical decontamination using Zyme-Flow technology, cargo oil and slop tank cleaning, process plant and pipework cleaning, caisson cleaning with CCTV inspection, NORM decontamination and disposal, crude oil storage tank cleaning, and dry ice cleaning) and Industrial Services (DISAB material handling, liquid ring tankers, emergency response). These services are supported by Water Jetting (2,000-40,000 psi pressures, non-man entry automated systems) and Liquid Waste Management (vacuum tankers, HazcoTainers). A comprehensive Equipment Hire fleet provides specialized machinery including HP/UHP jetting units (57 LPM, 79 LPM, 18 LPM UHP), hot wash units, vacuum units (75-100 HP, Premier Vacuum Transfer System), pumps (Hydraulic Molex, Diaphragm), NESL tank sweep packages, and accessory equipment (oil skimmers, overboard chutes, hose spoolers, hydraulic dozers). The company operates primarily in oil and gas, petrochemicals, utilities, manufacturing, marine, and energy sectors across UK and international markets.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 100% waste removal success rate on all offshore projects
• +5 more outcomes

Named customers3 records

Segments6 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Zyme-FlowcoreTechnology or IntegrationExclusive UK Licensee for Zyme-Flow chemical decontamination technology. The partnership provides proprietary chemistry for hydrocarbon process equipment decontamination achieving vessel entry in 8-12 hours. Denholm Environmental has completed hundreds of decontamination scopes across UK terminals, refineries, platforms and supported the franchise overseas.
• Denholm MacNameecoreStrategic or Co-development PartnerHazco Environmental was acquired by Denholm MacNamee in March 2020 and merged into Denholm MacNamee on October 1, 2021 to create Denholm Environmental. Parent company within Denholm Energy Services group.
• Relay Engineering GroupminorStrategic or Co-development PartnerFellow Denholm Energy Services company providing complementary engineering services within the group portfolio.
• PetrascominorStrategic or Co-development PartnerFellow Denholm Energy Services company providing services within the group portfolio.
• Denholm Zholdas GroupminorStrategic or Co-development PartnerFellow Denholm Energy Services company operating in Kazakhstan.
• Denholm YamminorStrategic or Co-development PartnerFellow Denholm Energy Services company operating in UAE.

Scale indicators11 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Stork (a Fluor Company): Stork provides industrial services, including cleaning, maintenance, and modification, to oil & gas and petrochemical clients onshore and offshore — directly comparable to Hazco's oilfield services, FPSO tank cleaning and turnaround offerings.
• MISTRAS Group: Provider of non-destructive testing, inspection, and industrial cleaning services to oil & gas, petrochemical and power customers — directly comparable in offering industrial cleaning and turnaround services for the same refinery and offshore customer base.
• STRUCINOX / STRUCTURAL Group: Industrial services firm providing cleaning, decontamination and turnaround services to oil refineries, petrochemical plants and power generation operators in Europe — directly comparable in turnaround cleaning, decontamination and tank services for refining customers.
• Brimmond: UK-based specialist rental provider of HP/UHP water jetting, vacuum, pumping and tank cleaning equipment to oil & gas, utilities and infrastructure markets — directly comparable equipment hire and industrial cleaning model with overlapping customer base.

Emerging players

• Sulzer: Swiss industrial engineering group providing pumps, rotating equipment services and process cleaning for oil & gas, petrochemical and power customers — comparable in providing specialist pump and cleaning solutions for refinery/petrochemical turnarounds, though primarily equipment-focused.

Broad incumbents

• Veolia Environmental Services: Global environmental services group covering hazardous waste treatment, industrial cleaning and remediation across oil & gas, petrochemical and industrial customers — comparable hazardous waste and decontamination capabilities, but operating at much greater scale and breadth.
• Worley: Global engineering and industrial services firm serving oil & gas, refining, petrochemical and energy customers — comparable in serving the same offshore platform, FPSO and refinery customer base with maintenance, modification and turnaround work.
• Clean Harbors: North American environmental and industrial services company focused on hazardous waste management, emergency response and industrial cleaning — directly comparable in hazardous waste handling and spill/emergency response, though much larger and geographically concentrated in North America.
• Bilfinger: European-headquartered industrial services group serving oil & gas, petrochemicals, energy and process industries with maintenance, cleaning, inspection and environmental services — comparable end markets and turnkey service model though much larger and broader portfolio.

Regional players

• ASCO (DCC Energy Services): UK and Norway-headquartered oil & gas support services provider offering equipment rental, logistics and industrial services to offshore operators — directly comparable equipment hire and industrial services offering in the same North Sea customer base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Hazco Environmental