# UK Sewage Treatment Plant Price Index

> For 6-person, the median published figure in the UK Sewage Treatment Plant Price Index is 2,196 GBP across 3 figures from the sources' own pages (range 2,061.89 to 2,196 GBP), read 28 October 2026.

Sewage treatment plant · https://sewagetreatmentplantcost.co.uk/datasets/uk-sewage-treatment-plant-price-index/ · computed 2026-10-28

**Median for 6-person:** 2,196 GBP (range 2,061.89 to 2,196 GBP; 6 published figures; 5 of 28 sources read publish one).

5 of the 28 named sources read in full publish a figure; 23 publish none, read 28 October 2026.

## By size

| Breakdown | Median | Range | Sources |
|---|---|---|---|
| size 6-person | 2,196 GBP | 2,061.89 to 2,196 GBP | 3 |
| size 9-person | 3,532.1 GBP | 2,308.2 to 4,756 GBP | 2 |
| size smallest-domestic-from | 1,430 GBP | 1,430 to 1,430 GBP | 1 |

## Every figure, with its source

One row per source: the figure the source's own page publishes, the page, and the day it was read.

| Source | Figure | Breakdown | Read |
|---|---|---|---|
| [Klargester BioDisc BX Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biodisc-bx-sewage-treatment-plant-9-people) | 4,756 GBP | 9-person | 2026-10-28 |
| [Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/sewage-treatment-plants/) | 2,308.2 GBP | 9-person | 2026-10-28 |
| [Klargester BioTec+ 2 Sewage Treatment Plant - 6 Person - Tanks Direct](https://tanks-direct.co.uk/klargester-bioair-2-economy-sewage-treatment-plant-6-person/p46341) | 2,196 GBP | 6-person | 2026-10-28 |
| [Klargester BioTec+ 6 person Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biotec-6-person-sewage-treatment-plant) | 2,196 GBP | 6-person | 2026-10-28 |
| [Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/sewage-treatment-plants/) | 2,061.89 GBP | 6-person | 2026-10-28 |
| [Sewage Treatment Plants UK \| WTE](https://www.wte-ltd.co.uk/sewage-treatment-plants) | 1,430 GBP + VAT | smallest-domestic-from | 2026-10-28 |

## The sentence each figure was read from (6)

- [Klargester BioDisc BX Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biodisc-bx-sewage-treatment-plant-9-people), read 2026-10-28: "from £4,756.00"
- [Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/sewage-treatment-plants/), read 2026-10-28: "£2,308.20 ex."
- [Klargester BioTec+ 2 Sewage Treatment Plant - 6 Person - Tanks Direct](https://tanks-direct.co.uk/klargester-bioair-2-economy-sewage-treatment-plant-6-person/p46341), read 2026-10-28: "YOUR PRICE · EX VAT £2,196.00"
- [Klargester BioTec+ 6 person Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biotec-6-person-sewage-treatment-plant), read 2026-10-28: "from £2,196.00"
- [Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/sewage-treatment-plants/), read 2026-10-28: "£2,061.89 ex."
- [Sewage Treatment Plants UK \| WTE](https://www.wte-ltd.co.uk/sewage-treatment-plants), read 2026-10-28: "From £1,430 + VAT."

## Read in full, publishes no figure

- [Sewage Treatment Systems - Wastewater Management - JDP - Page 2](https://store.jdpipes.co.uk/sewage-treatment/?page=2), read 2026-10-28: every candidate on the page was refused
- [Klargester BioDisc BA Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biodisc-ba-sewage-treatment-plant-6-people), read 2026-10-28: every candidate on the page was refused
- [Klargester BK BioDisc Sewage Treatment Plant, Tanks Direct](https://www.tanks-direct.co.uk/klargester-bk-biodisc-sewage-treatment-plant/p43121), read 2026-10-28: every candidate on the page was refused
- [Klargester BL BioDisc Sewage Treatment Plant, Tanks Direct](https://tanks-direct.co.uk/products/klargester-bl-biodisc-sewage-treatment-plant), read 2026-10-28: every candidate on the page was refused
- [How much it costs to install a septic system in the UK](https://www.premiertechaqua.com/en-gb/blog/domestic-sewage-treatment-plant-cost), read 2026-10-28: every candidate on the page was refused
- [How much it costs to install a septic system in the UK](https://www.premiertechaqua.com/en-gb/installation/estimated-project-costs), read 2026-10-28: every candidate on the page was refused
- [Sewage Treatment Plant Installation Costs UK, What to Charge to Install One in 2026](https://www.trade2base.com/blog/sewage-treatment-plant-installation-costs-uk), read 2026-10-28: every candidate on the page was refused
- [How much does the Ecoflo sewage treatment plant cost?](https://www.premiertechaqua.com/en-gb/blog/ecoflo-cost), read 2026-10-28: every candidate on the page was refused
- [Sewage Treatment Plant Installation Costs UK \| squote](https://squote.app/knowledge/costs/sewage-treatment-plant-installation-pricing-guide), read 2026-10-28: every candidate on the page was refused
- [Installing a Septic Tank Costs Explained - MyBuilder](https://www.mybuilder.com/groundwork-foundations/price-guides/septic-tank-installation-cost), read 2026-10-28: every candidate on the page was refused
- [Septic Tank Installation Cost Guide (UK Prices 2026)](https://www.myjobquote.co.uk/costs/installing-septic-tank), read 2026-10-28: every candidate on the page was refused
- [The supply and installation Sewage Treatment Plant in Itchen Stoke, Hampshire - Find a Tender](https://www.find-tender.service.gov.uk/Notice/029796-2025), read 2026-10-28: read in full and no accepted figure on the page
- [The Installation of a New Sewage Treatment Plant at Portley Hill Depot, Littleport - Find a Tender](https://www.find-tender.service.gov.uk/Notice/020858-2022), read 2026-10-28: read in full and no accepted figure on the page
- [Installation of Sewage Treatment Plant System - Witcham Farm, Manea, Cambridgeshire - Find a Tender](https://www.find-tender.service.gov.uk/Notice/060595-2025), read 2026-10-28: read in full and no accepted figure on the page
- [THE PROVISION OF SEWAGE TREATMENT PLANT, SHALFLEET PRIMARY SCHOOL, ISLE OF WIGHT - Find a Tender](https://www.find-tender.service.gov.uk/Notice/002690-2026), read 2026-10-28: read in full and no accepted figure on the page
- [Replacing Your Septic Tank: Costs, Rule and Options](https://allertonuk.com/?p=16464), read 2026-10-28: every candidate on the page was refused
- [Marsh Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/marsh-sewage-treatment-plants/), read 2026-10-28: every candidate on the page was refused
- [Clearwater BioAir 6 Gravity Sewage Treatment Plant 20 Person, Tanks Direct](https://www.tanks-direct.co.uk/clearwater-bioair-cw6-sewage-treatment-plant-20-person/p47304), read 2026-10-28: every candidate on the page was refused
- [Water Technology Engineering](https://www.enviropro.co.uk/company/172350/Water-Technology-Engineering/), read 2026-10-28: every candidate on the page was refused
- [Servicing and Maintenance for Sewage Treatment Units](https://allertonuk.com/servicing-and-maintenance), read 2026-10-28: read in full and no accepted figure on the page
- [Sewage Treatment Calculator UK \| Plant Size Estimator](https://ukcalculator.com/sewage-treatment-calculator.html), read 2026-10-28: read in full and no accepted figure on the page
- [Let the Experts Take Care of your Domestic Waste Water Problems, Design Buy Build](https://designbuybuild.co.uk/let-experts-take-care-domestic-waste-water-problems/), read 2026-10-28: every candidate on the page was refused
- [Discontinued wastewater, rainwater and storage products](https://www.premiertechaqua.com/en-gb/wastewater-treatment/sewage-treatment-plant-asp), read 2026-10-28: read in full and no accepted figure on the page

## Methodology

Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 5 of the 28 named sources that could be read published a usable figure; 23 published none and are recorded as not published, never filled in; 2 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in GBP (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 6 figures, never sentences; 175 candidate sentence(s) were refused by a reviewer with the reason recorded. The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): the median and range of PUBLISHED unit prices per population equivalent (6, 9, 12 person and up) across UK retailers and manufacturers, ex VAT normalised, beside the published installed-cost estimates and the awarded values in public contract notices; the share of installers that publish an installed price at all

## Sources

- [Cost to Replace a Septic Tank in 2026 UK Guide \| BookaBuilderUK.com](https://www.bookabuilderuk.com/blog/septic-tank-replacement-cost-2026) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Systems - Wastewater Management - JDP - Page 2](https://store.jdpipes.co.uk/sewage-treatment/?page=2) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/sewage-treatment-plants/) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BioDisc BA Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biodisc-ba-sewage-treatment-plant-6-people) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BK BioDisc Sewage Treatment Plant, Tanks Direct](https://www.tanks-direct.co.uk/klargester-bk-biodisc-sewage-treatment-plant/p43121) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BL BioDisc Sewage Treatment Plant, Tanks Direct](https://tanks-direct.co.uk/products/klargester-bl-biodisc-sewage-treatment-plant) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BioDisc BX Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biodisc-bx-sewage-treatment-plant-9-people) (the publisher's own terms; quoted for reporting and comment)
- [How much it costs to install a septic system in the UK](https://www.premiertechaqua.com/en-gb/blog/domestic-sewage-treatment-plant-cost) (the publisher's own terms; quoted for reporting and comment)
- [How much it costs to install a septic system in the UK](https://www.premiertechaqua.com/en-gb/installation/estimated-project-costs) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Plant Installation Costs UK, What to Charge to Install One in 2026](https://www.trade2base.com/blog/sewage-treatment-plant-installation-costs-uk) (the publisher's own terms; quoted for reporting and comment)
- [How much does the Ecoflo sewage treatment plant cost?](https://www.premiertechaqua.com/en-gb/blog/ecoflo-cost) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Plant Installation Costs UK \| squote](https://squote.app/knowledge/costs/sewage-treatment-plant-installation-pricing-guide) (the publisher's own terms; quoted for reporting and comment)
- [Installing a Septic Tank Costs Explained - MyBuilder](https://www.mybuilder.com/groundwork-foundations/price-guides/septic-tank-installation-cost) (the publisher's own terms; quoted for reporting and comment)
- [Septic Tank Installation Cost Guide (UK Prices 2026)](https://www.myjobquote.co.uk/costs/installing-septic-tank) (the publisher's own terms; quoted for reporting and comment)
- [The supply and installation Sewage Treatment Plant in Itchen Stoke, Hampshire - Find a Tender](https://www.find-tender.service.gov.uk/Notice/029796-2025) (the publisher's own terms; quoted for reporting and comment)
- [The Installation of a New Sewage Treatment Plant at Portley Hill Depot, Littleport - Find a Tender](https://www.find-tender.service.gov.uk/Notice/020858-2022) (the publisher's own terms; quoted for reporting and comment)
- [Installation of Sewage Treatment Plant System - Witcham Farm, Manea, Cambridgeshire - Find a Tender](https://www.find-tender.service.gov.uk/Notice/060595-2025) (the publisher's own terms; quoted for reporting and comment)
- [THE PROVISION OF SEWAGE TREATMENT PLANT, SHALFLEET PRIMARY SCHOOL, ISLE OF WIGHT - Find a Tender](https://www.find-tender.service.gov.uk/Notice/002690-2026) (the publisher's own terms; quoted for reporting and comment)
- [Replacing Your Septic Tank: Costs, Rule and Options](https://allertonuk.com/?p=16464) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BioTec+ 2 Sewage Treatment Plant - 6 Person - Tanks Direct](https://tanks-direct.co.uk/klargester-bioair-2-economy-sewage-treatment-plant-6-person/p46341) (the publisher's own terms; quoted for reporting and comment)
- [Klargester BioTec+ 6 person Sewage Treatment Plant, Fuel Tank Shop](https://fueltankshop.co.uk/products/klargester-biotec-6-person-sewage-treatment-plant) (the publisher's own terms; quoted for reporting and comment)
- [Marsh Sewage Treatment Plants - JDP](https://store.jdpipes.co.uk/marsh-sewage-treatment-plants/) (the publisher's own terms; quoted for reporting and comment)
- [Clearwater BioAir 6 Gravity Sewage Treatment Plant 20 Person, Tanks Direct](https://www.tanks-direct.co.uk/clearwater-bioair-cw6-sewage-treatment-plant-20-person/p47304) (the publisher's own terms; quoted for reporting and comment)
- [Water Technology Engineering](https://www.enviropro.co.uk/company/172350/Water-Technology-Engineering/) (the publisher's own terms; quoted for reporting and comment)
- [Servicing and Maintenance for Sewage Treatment Units](https://allertonuk.com/servicing-and-maintenance) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Calculator UK \| Plant Size Estimator](https://ukcalculator.com/sewage-treatment-calculator.html) (the publisher's own terms; quoted for reporting and comment)
- [Let the Experts Take Care of your Domestic Waste Water Problems, Design Buy Build](https://designbuybuild.co.uk/let-experts-take-care-domestic-waste-water-problems/) (the publisher's own terms; quoted for reporting and comment)
- [Discontinued wastewater, rainwater and storage products](https://www.premiertechaqua.com/en-gb/wastewater-treatment/sewage-treatment-plant-asp) (the publisher's own terms; quoted for reporting and comment)
- [Sewage Treatment Plants UK \| WTE](https://www.wte-ltd.co.uk/sewage-treatment-plants) (the publisher's own terms; quoted for reporting and comment)
- [find-tender.service.gov.uk](https://www.find-tender.service.gov.uk/Search) (the publisher's own terms; quoted for reporting and comment)

## Cite or embed

- For 6-person, the median published figure in the UK Sewage Treatment Plant Price Index is 2,196 GBP across 3 figures from the sources' own pages (range 2,061.89 to 2,196 GBP), read 28 October 2026.
- 5 of the 28 named sources read in full publish a figure; 23 publish none, read 28 October 2026.
- UK Sewage Treatment Plant Price Index, size 6-person: median 2,196 GBP across 3 sources, read 28 October 2026.
- UK Sewage Treatment Plant Price Index, size 9-person: median 3,532.10 GBP across 2 sources, read 28 October 2026.
- UK Sewage Treatment Plant Price Index, size smallest-domestic-from: median 1,430 GBP across 1 source, read 28 October 2026.

Cite as: "sewagetreatmentplantcost.co.uk UK Sewage Treatment Plant Price Index", updated 2026-10-28, https://sewagetreatmentplantcost.co.uk/datasets/uk-sewage-treatment-plant-price-index/.

CSV: https://sewagetreatmentplantcost.co.uk/datasets/uk-sewage-treatment-plant-price-index.csv
JSON: https://sewagetreatmentplantcost.co.uk/datasets/uk-sewage-treatment-plant-price-index.json
Embed (plain HTML, static link back): see https://sewagetreatmentplantcost.co.uk/datasets/uk-sewage-treatment-plant-price-index/#median