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Wastewater Treatment Plant Construction in Pennsylvania and the Mid-Atlantic

Johnston Construction Company, based in Dover, Pennsylvania, has 59 documented wastewater treatment plants project profiles across Pennsylvania and the Mid-Atlantic.

Johnston Construction Company is a Dover, Pennsylvania construction contractor with documented wastewater treatment plant (WWTP) work for municipal, federal and industrial clients. The Pennsylvania projects below include treatment plant construction, replacement, rehabilitation and process-system upgrades; the full archive also covers work elsewhere in the Mid-Atlantic.

Documented scopes span biological treatment, aeration, clarifiers, digesters, sludge handling, UV disinfection, process piping, electrical systems and plant rehabilitation. Open each project profile for its location, Johnston’s role and the specific work described in the project record.

Pennsylvania project experience

Explore the documented work and Johnston’s role at each Pennsylvania project:

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Wastewater Treatment PlantsAberdeen Advanced Wastewater Treatment Plant Digester Gas Flare ImprovementsAberdeen, Harford County, MarylandJohnston Construction Company completed the Aberdeen Advanced Wastewater Treatment Plant Digester Gas Flare Improvements project for the City of Aberdeen. Wastewater Treatment PlantsAberdeen Proving Ground WWTP Digester No. 1 Cover ReplacementAberdeen, Harford County, MarylandJohnston Construction Company replaced the existing floating gas-holder cover serving Digester No. 1 at the Aberdeen Proving Ground Wastewater Treatment Plant. Wastewater Treatment PlantsAntietam Wastewater Treatment Plant UpgradesSharpsburg, Washington County, MarylandDemolished the existing headworks building and rehabilitated the existing concrete headworks structure. Wastewater Treatment PlantsCentral Correctional Facility Collection System UpgradeSykesville, Carroll County, MarylandJohnston Construction Company completed the Central Correctional Facility Collection System Upgrade for Maryland Environmental Service. Industrial and EnvironmentalCharles County LandfillWaldorf, MarylandThe project included design, construction, startup, performance testing, and operation of a landfill leachate pretreatment facility at the Charles County Landfill in Waldorf, Maryland. Wastewater Treatment PlantsChesapeake Beach WRTP Clarifier Launder Covers & Treatment Structure Access ImprovementsChesapeake Beach, Calvert County, MarylandJohnston Construction Company completed the Chesapeake Beach WRTP Clarifiers, Denitrification Filters, Mudwell & Clearwell Covers project for the Town of Chesapeake Beach. Wastewater Treatment PlantsCity Of Frederick Wastewater Treatment Plant – Digester No. 1 Scum Line Piping ModificationsFrederick, Maryland 21701Johnston Construction Company served as Prime Contractor for the Digester No. 1 Additional Scum Line Piping Project at the City of Frederick Wastewater Treatment Plant in Frederick… Wastewater Treatment PlantsCity Of Frederick Wastewater Treatment Plant – Floor Drain ReplacementFrederick, Maryland 21701Johnston Construction Company served as Prime Contractor for the replacement of two existing floor drains within the Digester Solids Handling Building at the City of Frederick… Wastewater Treatment PlantsCity Of Frederick WWTP – Anaerobic Digester Pipe Support RehabilitationFrederick, Maryland 21701Johnston Construction Company served as Prime Contractor for rehabilitation of piping-support systems within both anaerobic digesters at the City of Frederick Wastewater Treatment Plant. Wastewater Treatment PlantsCity of York WWTP – Train 2 Baffle InstallationYork, York County, PennsylvaniaJohnston Construction Company served as Prime Contractor for installation of new flow-deflection baffles within the Train 2 wastewater treatment process at the City of York WWTP. Wastewater Treatment PlantsDefense Distribution Center Susquehanna – New Cumberland WWTP ReplacementNew Cumberland, Cumberland County, PennsylvaniaJohnston Construction Company served as Prime Contractor for the comprehensive replacement of the wastewater treatment plant serving the Defense Distribution Center Susquehanna in New… Wastewater Treatment PlantsDorsey Run Advanced Wastewater Treatment Plant Sludge Dewatering UpgradeJessup, Howard County, MarylandThe project replaced two existing belt filter presses with two new high-speed centrifuge systems, including associated piping, valves, drives, controls, instrumentation, and… Wastewater Treatment PlantsEast York Interceptor UpgradeSpringettsbury Township, York County, PennsylvaniaFurnished and installed electrical power conduit, wiring and equipment connections for the East York Interceptor Upgrade. Wastewater Treatment PlantsFGGM WWTP Administration Building Boiler Room RehabilitationFort Meade, MarylandESD performed electrical lockout and demolition for equipment being replaced within the existing boiler-room facility. Wastewater Treatment PlantsFort George G. Meade WWTP Backwash Valve ReplacementFort Meade, MarylandJohnston Construction Company replaced the large-diameter gate and check valves serving Backwash Pumps 1 and 2 at the Fort George G. Meade Wastewater Treatment Plant. Wastewater Treatment PlantsFort George G. Meade WWTP Post-Aeration & Effluent Structures 1 and 2 RehabilitationFort Meade / Laurel, MarylandProvided engineering, design and construction for rehabilitation of two existing post-aeration and effluent structures at the Fort Meade WWTP. Wastewater Treatment PlantsFort George G. Meade WWTP – Fine Screen Parts ReplacementFort Meade / Laurel, MarylandJohnston Construction Company rehabilitated two fine-screen systems serving the Fort George G. Meade Wastewater Treatment Plant. Wastewater Treatment PlantsFort Meade Wastewater Treatment Plant Grit Removal System RehabilitationFort Meade / Laurel, MarylandConcrete Services Division, LLC performed specialized concrete construction for rehabilitation of the grit removal system at the Fort George G. Meade Wastewater Treatment Plant. Wastewater Treatment PlantsFort Meade Wastewater Treatment Plant Ultraviolet Redundant SystemFort Meade, MarylandJohnston Construction Company provided design-build services for a redundant ultraviolet disinfection system at the Fort Meade Wastewater Treatment Plant. Wastewater Treatment PlantsFort Meade WWTP – Intermediate & Emergency Effluent Pump ReplacementsFort George G. Meade, MarylandJohnston Construction Company was selected by American Water Operations and Maintenance, Inc. to complete the design-build rehabilitation and replacement of the Intermediate and… Wastewater Treatment PlantsFort Meade WWTP – WAS & RAS Pump ReplacementsFort George G. Meade, MarylandServed as Civil Subcontractor to American Water Operations and Maintenance, Inc. for the Waste Activated Sludge (WAS) and Return Activated Sludge (RAS) pump replacement project at the… Wastewater Treatment PlantsFrederick Digester Mixing EquipmentFrederick, MarylandDelivered a design-build digester mixing equipment project for the City of Frederick Wastewater Treatment Plant. Wastewater Treatment PlantsGeorge's Chicken Wastewater Treatment System ImprovementsEdinburg, Shenandoah County, VirginiaJohnston Construction Company served as Prime Contractor for the wastewater treatment system improvements at George’s Chicken’s Edinburg, Virginia facility. Wastewater Treatment PlantsGifford Pinchot State Park Sewage Treatment Plant RehabilitationWarrington Township, York County, PennsylvaniaJohnston Construction Company served as the prime General Contractor for the rehabilitation of the sewage-treatment plant and main lift station at Gifford Pinchot State Park. Wastewater Treatment PlantsGiorgio Foods Industrial WWTP Phase I UpgradeBlandon, Berks County, PennsylvaniaServed as Prime Contractor directly to Giorgio Foods, Inc. for the comprehensive Phase I upgrade of the company's industrial wastewater treatment plant in Maidencreek Township, Pennsylvania. Wastewater Treatment PlantsGiorgio Foods WWTP Phase 1 – Lagoon Aeration System ImprovementsReading, Berks County, PennsylvaniaUpgraded the existing industrial wastewater treatment lagoon aeration system through installation of a new Parkson Biolac® W aeration system while maintaining wastewater treatment… Wastewater Treatment PlantsHagerstown WWTP Biosolids Upgrade Phase 1B – DAFT RehabilitationHagerstown, Washington County, MarylandPerformed the major civil and process rehabilitation package for the Hagerstown Wastewater Treatment Plant Biosolids Upgrade Phase 1B, centered on replacement and modernization of the… Wastewater Treatment PlantsHagerstown WWTP Phase 2 Dryer RehabilitationHagerstown, Washington County, MarylandPerformed the major electrical construction package associated with the Phase 2 Dryer Rehabilitation at the City of Hagerstown Wastewater Treatment Plant. Wastewater Treatment PlantsHagerstown WWTP – Sludge Storage & Digester Conversion ImprovementsHagerstown, Washington County, MarylandJohnston Construction Company served as the Design-Build Subcontractor for the conversion of existing Secondary Digester No. 2 into an additional sludge holding tank at the Hagerstown… Wastewater Treatment PlantsKent County Regional Resource Recovery Facility – Blower Optimization & Standby Power ImprovementsMilford, Kent County, DelawareJohnston Construction Company installed two Owner-furnished high-speed turbo blowers at the Kent County Regional Resource Recovery Facility. Wastewater Treatment PlantsLancaster City WWTP – South Train Flow Diversion Weir Gate RepairLancaster, Pennsylvania 17603Johnston Construction Company served as Prime Contractor for repair of an existing flow-diversion weir gate at the City of Lancaster Wastewater Treatment Plant. Wastewater Treatment PlantsLower Allen Township WWTF Gravity Thickener ImprovementsNew Cumberland, Cumberland County, PennsylvaniaRehabilitated two existing 40-foot-diameter gravity thickeners, each enclosed by a fiberglass dome, while maintaining operation of the active Lower Allen Township Authority wastewater… Wastewater Treatment PlantsMarlay Taylor Water Reclamation Facility Secondary Clarifier No. 1 ReplacementLexington Park, St. Mary's County, MarylandJohnston Construction Company completed the Marlay Taylor Water Reclamation Facility Secondary Clarifier No. 1 Replacement project for the St. Mary’s County Metropolitan Commission. Wastewater Treatment PlantsMattawoman Wastewater Treatment Plant Energy-Saving Improvements – UV System UpgradeLa Plata, Charles County, MarylandJohnston Construction Company performed the construction and installation work associated with the Mattawoman Wastewater Treatment Plant Energy-Saving Improvements UV System Upgrade. Wastewater Treatment PlantsMattawoman Water Reclamation Facility – Primary Clarifier No. 1 ImprovementsLa Plata, Charles County, MarylandServed as Prime Contractor for comprehensive improvements to Primary Clarifier No. 1 at the operating Mattawoman Water Reclamation Facility. Wastewater Treatment PlantsMattawoman WWTP Building 22A Doorway ExpansionLa Plata, Charles County, MarylandServed as Prime Contractor for the Building 22A exterior doorway modification at the operating Mattawoman Wastewater Treatment Plant. The primary objective of the project was to… Wastewater Treatment PlantsMill Bottom WWTP – ICEAS Treatment System Electrical ImprovementsMount Airy, Frederick County, MarylandPerformed the electrical construction associated with the Mill Bottom Wastewater Treatment Plant Facility Upgrade for Frederick County. Wastewater Treatment PlantsMillsboro 100,000-Gallon Elevated Effluent Storage TankMillsboro, Sussex County, DelawareJohnston Construction Company performed foundation, dewatering, piping, and conduit bank construction work for the Millsboro 100Kgal EWST project in Sussex County, Delaware. Wastewater Treatment PlantsOcean City 64th Street WWTP – Disinfection System Preconstruction ServicesOcean City, Worcester County, MarylandJohnston Construction Company provided preconstruction and construction budget-estimating services for the Town of Ocean City’s planned Disinfection System Upgrades at the 64th Street… Wastewater Treatment PlantsOcean City 64th Street WWTP – Secondary Clarifier Preconstruction ServicesOcean City, Worcester County, MarylandJohnston Construction Company provided preconstruction, value-engineering and budget-estimating services for the Town of Ocean City’s planned secondary clarifier improvements at the… Wastewater Treatment PlantsOcean City WWTP – Disinfection System UpgradesOcean City, Worcester County, MarylandConverted the wastewater treatment plant's existing chlorine and sulfur dioxide gas disinfection systems to new liquid sodium hypochlorite and sodium bisulfite chemical-feed systems… Wastewater Treatment PlantsOcean City WWTP – Fournier Rotary Press ReplacementOcean City, Worcester County, MarylandCompleted replacement and installation of a Fournier Rotary Press sludge-dewatering system at the Ocean City Wastewater Treatment Plant. Wastewater Treatment PlantsOcean City WWTP – Headworks Sluice Gate & Equipment RepairsOcean City, Maryland 21842Johnston Construction Company served as Prime Contractor for repair work at the Ocean City Wastewater Treatment Plant headworks facility. Wastewater Treatment PlantsOcean City WWTP – North & South Clarifier FRP Walkway PlatformOcean City, Worcester County, MarylandServed as Prime Contractor for the installation of a new fiberglass reinforced plastic (FRP) walkway platform between the North and South Clarifiers at the Town of Ocean City's… Wastewater Treatment PlantsPerdue Foods Wastewater Pretreatment System Upgrade – DAF Cell No. 1Georgetown, Sussex County, DelawareServed as Prime Contractor for a comprehensive upgrade to Perdue Foods' wastewater pretreatment facility in Georgetown, Delaware. Wastewater Treatment PlantsPiscataway WRRF Grit Bucket Elevator No. 3 RebuildAccokeek, Prince George's County, MarylandPerformed a substantial rebuild of Grit Bucket Elevator No. 3 at the operating Piscataway Water Resource Recovery Facility. Wastewater Treatment PlantsPiscataway WWTP – Grit Bucket Elevator No. 1 RebuildAccokeek, Maryland 20607-9767Johnston Construction Company served as Prime Contractor for the substantial turnkey rebuild of existing Grit Bucket Elevator No. 1 at the Piscataway Wastewater Treatment Plant. Wastewater Treatment PlantsPoolesville WWTP – Belt Filter Press ReplacementPoolesville, Maryland 20837Johnston Construction Company served as Prime Contractor for replacement of the sludge-dewatering belt filter press at the Poolesville Wastewater Treatment Plant. Wastewater Treatment PlantsPreston Wastewater Treatment Plant UpgradePreston, Caroline County, MarylandServed as Prime Contractor for a comprehensive modernization of the Town of Preston Wastewater Treatment Plant. Wastewater Treatment PlantsSod Run WWTP – Pump No. 2 VFD ReplacementPerryman, Harford County, MarylandServed as Prime Contractor directly to Harford County, Maryland for replacement of the Variable Frequency Drive serving Pump No. 2 at the Sod Run Wastewater Treatment Plant. Wastewater Treatment PlantsSusquehanna Water Pollution Control Facility Disinfection ImprovementsWashington Boro, Lancaster County, PennsylvaniaJohnston Construction Company served as the Prime Contractor for Contract One – General Construction for the Lancaster Area Sewer Authority's Susquehanna Water Pollution Control… Wastewater Treatment PlantsTyson Foods New Holland Wastewater Facility – Sulfuric Acid Chemical Piping ReplacementNew Holland, Lancaster County, PennsylvaniaServed as Prime Contractor for the chemical-piping improvements at Tyson's New Holland wastewater facility in New Holland, Pennsylvania. Wastewater Treatment PlantsWashington Township WWTP Sequencing Batch Reactor Valve ReplacementWaynesboro, Franklin County, PennsylvaniaJohnston Construction Company served as the prime contractor for the replacement and modification of critical process equipment within two existing sequencing batch reactor tanks. Wastewater Treatment PlantsWastewater Treatment Plant Grit Removal System ReplacementWaynesboro, PennsylvaniaJohnston Construction Company performed general construction work for the Wastewater Treatment Plant Grit Removal System Replacement project in Waynesboro, Pennsylvania. Wastewater Treatment PlantsY&S Candies Anaerobic Membrane Bioreactor Process Piping ModificationsLancaster, Lancaster County, PennsylvaniaJohnston Construction Company completed mechanical, electrical, and insulation modifications to the anaerobic membrane bioreactor systems serving the Y&S Candies wastewater-treatment… Wastewater Treatment PlantsY&S Candies – MBR Internals InstallationLancaster, Pennsylvania 17603Johnston Construction Company served as Civil Subcontractor for the installation of membrane bioreactor (MBR) internals at the Y&S Candies wastewater pretreatment facility in… Wastewater Treatment PlantsY&S Candies – MBR Piping And System Tie-InsLancaster, Pennsylvania 17603Johnston Construction Company served as Civil Subcontractor for the wastewater pretreatment system expansion at the Y&S Candies manufacturing facility in Lancaster, Pennsylvania, under… Wastewater Treatment PlantsYork City Sewer Authority – Digester No. 2 Roof Demolition & AssessmentYork, York County, PennsylvaniaJohnston Construction Company performed the controlled demolition and removal of the existing roof system at Digester No. 2. Wastewater Treatment PlantsYuengling Sewage Treatment Plant – Scrubber & Polisher RehabilitationPottsville, Schuylkill County, PennsylvaniaJohnston Construction Company served as Prime Contractor for the rehabilitation of the scrubber system at Yuengling Beer Company's sewage treatment plant in Pottsville, Pennsylvania.