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Harrison Civils & National Rivers Consortium

Harrison Civils & National Rivers Consortium

5.0(96 reviews)See reviews ↓·Norwich

About the company

Harrison Civils is a specialist civil engineering contractor and sewage treatment plant manufacturer, supplier, installer and maintainer with over 30 years of experience working with sewage treatment plants throughout England. The company is a member of British Water and works with partners Norfolk Rivers Consortium and National Rivers Consortium, as well as multiple councils across the UK, Natural England and the Environment Agency.

Its purpose is to work alongside Natural England and The Environment Agency to reduce water contamination in England's rivers and achieve Nutrient Neutrality. Harrison Civils installs sewage treatment plants and rainwater harvesting systems across Norfolk, Suffolk and Cambridgeshire, and holds the largest stock of new plants and spares in the South and East of England. Its teams have installed thousands of sewage treatment plants. Services include free septic tank upgrades in Kent and Norfolk and nutrient credits across the UK.

Rodger Harrison is the founder and Managing Director. Zak Simmonds is the Technical/Engineering Lead and has worked in nutrient neutrality since 2021, involved in over 500 nutrient assessments. Conrad Webb is the Commercial Director, Graham Sinclair is the UK Operations Manager, Darren Wood is the Office Manager and Coordinator, Phoebe Blay is the Accounts Manager, John Mace is the Construction Manager, and Elsa Poulter is the Marketing and Public Relations Manager.

What customers say

Based on genuine customer reviews

Harrison Civils & National Rivers Consortium handles septic tank and sewage treatment installations in the Norwich area, and the feedback left by customers keeps returning to how calmly complex jobs are managed. Several accounts describe swapping old, failing tanks for modern treatment plants, in some cases through the nutrients neutrality scheme, and the common thread is that the process ran to schedule and was explained clearly at every stage. Staff names recur: Darren, who walked homeowners through the paperwork and fielded questions without making anyone feel foolish, Sophie in the office, credited with smooth administration and steady communication, and Andy and John, who excavated trenches and positioned tanks in heavy wet clay.

Expertise and guidance feature often, from Darren and from the surveyors who visited properties to set out what the work would involve. Reviewers frequently highlight how polite, accommodating and clean the crews were, leaving sites tidy and, in one instance, a broader driveway behind. Customers point to the finish achieved, the pace of the work and the dependability of those on site, whether the task was a treatment plant, a drainage field or pipework repairs.

ConsultantWaste water and sewage treatment company
Harrison Civils & National Rivers Consortium — Customer photo
Harrison Civils & National Rivers Consortium — Customer photo
Harrison Civils & National Rivers Consortium — Customer photo
Harrison Civils & National Rivers Consortium — Customer photo
Harrison Civils & National Rivers Consortium — Customer photo
Harrison Civils & National Rivers Consortium — Customer photo

Reviews

Reviews are taken from publicly available sources.

AS
Andy Smith11 August 2026

I recently needed to replace our old septic tank with a new Sewage Treatment Plant + a new drainage field. I don’t live close to a river or pond, so didn’t benefit from the grants that others have mentioned meaning it was a sizable spend for me, but I was delighted with the work that Harrison Civils completed. The team had clearly done many of these before (several hundred I recall them saying!) and the work was done on schedule (only 2 ½ days), with no problems and the end cost was as per their original quote. The new system has worked perfectly since, so a big thank you to the team (Richard, Simon, Luke, Chas and Darren) for a very professional and high quality installation.

JH
Joanna Hanley26 May 2026

We had an excellent install from start to finish. John attended for the site survey and very informative. The install was well managed and the guys cleared up after they had finish. Then John came and did the commissioning check. Thanks to John, Andy, Simon and Rick. Would highly recommend.

AM
Adrian Morris8 April 2026

Harrison Civils and National Rivers Consortium has just completed an installation of an upgrade to the septic tank at our property in Kent. I was very impressed with their professionalism and skill in doing their job, and how impeccably tidy they left the site on completion. In particular, I would like to thank Deborah and Sophie in the Office; John who did the preliminary survey, and Andy, Simon, Rick and Harley, who did the installation , as well as Joss the electrician. Their interpersonal skills were excellent, and they functioned as a seamless and efficient team. Thank you very much.

MF
Michael Fernando13 March 2026

We have consistently worked with Norfolk rivers/harrisons civils for the past year now and they have always been so polite and accommodating. A very well put together company with experienced staff. Always a pleasure to be here on site.

AB
Adam Beard13 March 2026

We visit Harrison civil very frequently and the staff are always so kind and friendly. Cleanliness and presentation is next to none, this combined with the hospitality levels makes it a very pleasant visit.

EG
Emile Greenwood20 February 2026

We had our new treatment plant installed by Andy & John and they did a fantastic job. In and out in three days and all working fine on installation. The guy where friendly and professional and kept up to date and informed all throughout the process. Would highly recommend.

SC
Stuart Clay13 February 2026

I have got to compliment the team on the way in which our free Sewage Treatment Plant has been installed right from Sophie effortlessly organising the admin, Andy working sometimes single handedly to dig the trench & the drain to the ditch and creating a mountain of waste in excavating the hole for the tank to be sited. Together with John they worked sometimes with the machinery up to its axles in very wet clay ground but were able to make good at the conclusion. Joss followed by connecting up the electrics in a most professional manner and the system began functioning within 4 days of the start.

Septic tanks & sewage in Norwich compared

Ordered by rating, weighted by the number of reviews — businesses with only a handful of reviews do not jump to the top automatically. 5 businesses in this category in Norwich are compared.

RankProviderRatingReviewsOpen Sat.
1Harrison Civils & National Rivers Consortium (this page)★ 5,096No
2Ace Septic Tank Services★ 5,033No
3E.E. Bartlett Ltd★ 5,030Yes
4East Anglian Tankering Norfolk★ 4,929Yes
5Go Tankers Ltd★ 4,030No
Contact
+441328854549www.harrisoncivils.comClay Hall Industrial Estate, Heath Ln, Great Witchingham, Norwich NR9 5QL
Working hours
Monday07:00–16:00
Tuesday07:00–16:00
Wednesday07:00–16:00
Thursday07:00–16:00
Friday07:00–16:00
SaturdayClosed
SundayClosed