Installing a rainwater collection system costs most homeowners $3,000 to $5,000 according to Angi and HomeAdvisor, and $1,000 to $3,500 according to Fixr.1,2,3 Angi and HomeAdvisor publish a matching $4,000 national average – Angi for a cistern, HomeAdvisor for a whole system – with reported prices spanning $120 for a simple rain barrel to $21,000 for an extensive underground installation, from guides updated October 2026 and June 2026.1,2 Fixr publishes a $2,500 national average for a dry system with a 5,000-gallon polyethylene tank installed, with low-end jobs at $150 (a rain barrel with a spigot) and high-end jobs at $15,000 (a 5,000-gallon steel tank with a wet system, irrigation, excavation, and a sprinkler), from a guide updated January 2025.3 Prices below are national averages*.
*National averages, not local quotes. Your price depends on the system type, the tank size and material, and how complex the installation is.
Safety note: the CDC says rainwater is not necessarily safe to drink without first removing germs and chemicals, and that even clean-looking rainwater can pick up contaminants from the air and from roofing materials, gutters, piping, and storage materials. If you drink, cook, or bathe with collected rainwater, the CDC advises testing it regularly for germs and chemicals and contacting your local health department for advice on testing, treating, and safely using rainwater.4
$4,000
national average – cistern / whole system (Angi/HomeAdvisor)
$2,500
national average – dry system, 5,000-gal polyethylene tank installed (Fixr, 2025)
$1,500–$4,500
above-ground cistern (Angi/HomeAdvisor)
$120–$160
rain barrel, unit only (Fixr, 2025)
What the sources say
| Source | Headline figures | Notes |
|---|---|---|
| Angi (updated Oct 2026) | $4,000 national average for a cistern; most homeowners $3,000 – $5,000; installed systems $3,000 – $21,000 for larger tanks; high-end off-grid underground systems up to $22,000 with labor and features | Corporate sibling of HomeAdvisor – the pair publishes matching figures on their pages |
| HomeAdvisor (2025 data, updated Jun 2026) | $4,000 average; normal range $3,000 – $5,000; reported span $120 (a simple rain barrel) to $21,000 (an extensive underground harvesting system) | Matching figures alone don’t establish independent corroboration between the siblings |
| Fixr (updated Jan 2025) | $2,500 national average for a dry system with a 5,000-gallon polyethylene tank installed; range $1,000 – $3,500; low-end $150 (a rain barrel with a spigot); high-end $15,000 (a 5,000-gallon steel tank with a wet system, irrigation, excavation, and a sprinkler) | Average covers a defined job scope; figures are older |
The sibling pair publishes matching figures throughout, presented as published. Fixr’s figures are separately published and older (January 2025), with no shared sourcing stated, so they are presented separately and not compared directly.
Cost by harvesting method
The sources describe two methods: rooftop harvesting, where the roof and gutters feed a storage tank, and surface runoff harvesting, where the ground itself is the collection area and the tank usually sits below it.2,3
| Method (labor included) | Fixr (2025) | HomeAdvisor |
|---|---|---|
| Rooftop harvesting | $1,000 – $5,000 | $1,000 – $5,000 (average $3,000) |
| Surface runoff harvesting | $8,000 – $15,000 | – |
The rooftop figure matches across Fixr and HomeAdvisor; these are separately published figures, and the pages state no shared sourcing.
Cost by system type
Each publisher uses its own labels and scopes – rain barrel versus installed barrel, dry versus above-ground, wet versus underground – so the rows are not compared directly.1,2,3
| System type | Cost | Source and scope |
|---|---|---|
| Rain barrel | $120 – $160 | Fixr (2025), unit only |
| Rain barrel (100-gallon) | $120 – $2,160 | HomeAdvisor, installed |
| Dry system | $1,000 – $5,000 | Fixr (2025) |
| Dry system | $120 – $4,500 | HomeAdvisor |
| Above-ground cistern | $1,500 – $4,500 | Angi/HomeAdvisor |
| Wet system | $8,000 – $15,000 | Fixr (2025) |
| Wet system | $5,000 – $21,000 | HomeAdvisor |
| Underground cistern | $5,000+ | Angi |
The above-ground cistern figure matches across the sibling pair; matching figures alone don’t establish independent corroboration between corporate siblings. Angi prices smaller tanks under 200 gallons at $120 – $600.1
Tank cost by material
All three sources price a 5,000-gallon tank by material; Fixr’s ranges match HomeAdvisor’s exactly. These are separately published figures, and the pages state no shared sourcing.1,2,3
| Material (5,000-gallon tank) | Fixr (materials only) | HomeAdvisor (materials only) | Angi (average) |
|---|---|---|---|
| Polyethylene | $2,000 – $4,000 | $2,000 – $4,000 (avg $3,000) | $3,000 |
| Fiberglass | $2,000 – $5,000 | $2,000 – $5,000 (avg $3,500) | $3,500 |
| Steel | $3,000 – $6,000 | $3,000 – $6,000 (avg $4,500) | $4,500 |
| Concrete | $3,000 – $6,000 | $3,000 – $6,000 (avg $4,500) | $4,500 |
The sibling averages match each other; matching figures alone don’t establish independent corroboration. Across all tank sizes, HomeAdvisor publishes spans of $825 – $21,000 for polyethylene and $300 – $30,000 for fiberglass, and prices a small 80-gallon steel tank at $300.2 For a fully installed underground 5,500-gallon concrete cistern including excavation, backfilling, grading, and filtration, HomeAdvisor publishes $17,000 – $21,000.2
Component costs
Every system combines four core components. Fixr and HomeAdvisor publish nearly identical materials-only ranges for them; the matching rows are separately published figures, and the pages state no shared sourcing.2,3
| Component (materials only) | Fixr (2025) | HomeAdvisor |
|---|---|---|
| Filtration system | $75 – $200 | $75 – $200 (avg $140) |
| Conveyance system | $100 – $1,500 | $100 – $1,500 (avg $800) |
| Water storage | $120 – $6,000 | $130 – $6,000 (avg $3,060) |
| Collection area | $500 – $9,000 | $500 – $9,000 (avg $4,750) |
The water storage low ends differ by $10 between the two publishers; the pages do not explain the difference.
Optional add-on components
Fixr and HomeAdvisor publish identical materials-only ranges for optional add-ons; these are separately published figures, and the pages state no shared sourcing.2,3
| Add-on (materials only) | Price range | HomeAdvisor average |
|---|---|---|
| Gutter mesh | $0.80 – $1.25 per linear foot | $1 per linear foot |
| Gutter outlets | $5 – $10 | $7.50 |
| Downspout screen | $10 – $50 | $30 |
| Tank screen | $10 – $50 | $30 |
| First flush diverter | $20 – $60 | $40 |
| Tank gauge | $30 – $50 | $40 |
| Top-up system | $100 – $200 | $150 |
| Pump | $150 – $300 | $225 |
Installation and labor costs
The publishers price labor and installation work differently, and the figures cover different scopes, so they are not compared directly.1,2,3
| Item | Cost | Source and scope |
|---|---|---|
| Landscaper hourly rate | $50 – $100 | Fixr (2025) |
| Plumber hourly rate | $75 – $130 | Fixr (2025) |
| Plumber hourly rate | $45 – $200 | HomeAdvisor |
| Tank installation | $250 – $1,300+ | Fixr (2025), simplest to more intricate jobs |
| Wet-system sprinkler and irrigation labor | $120 – $1,600 | Fixr (2025), 24 to 36 labor hours |
| Excavation (about three hours of equipment and operator) | $440 – $760 | Fixr (2025) |
| Excavation (full job) | $1,670 – $6,720 | HomeAdvisor |
| Regrading a lawn | $1,030 – $3,340 | HomeAdvisor |
| Water filtration system (installed) | $1,130 – $3,540 | HomeAdvisor |
| Piping and pumps | $200 – $500 | HomeAdvisor |
| Gutter repairs | $180 – $530 | Angi |
| New concrete work | $4 per sq.ft. | Angi |
Ongoing upkeep costs
Angi and HomeAdvisor publish matching annual upkeep figures for systems with filtration; matching figures alone don’t establish independent corroboration between the corporate siblings.1,2
| Upkeep item | Cost per year | Source |
|---|---|---|
| Filtration upkeep (bulbs and filters) | about $740 | Angi/HomeAdvisor |
| UV bulb and filter replacements | $250 | Angi/HomeAdvisor |
| Gutter cleaning | $160 per cleaning | Angi |
| Gutter cleaning | $170 per cleaning | HomeAdvisor |
| Pump replacement | $1,800 every 20 years | HomeAdvisor |
The sibling gutter-cleaning figures differ by $10; the pages do not explain the difference.
Related costs
| Item | Cost | Source |
|---|---|---|
| Downspouts (installed) | $300 – $600 | Fixr (2025) and HomeAdvisor |
| Gutter installation | average $1,030; $4 – $30 per linear foot | Angi/HomeAdvisor |
| Gutter installation | $900 – $5,000 | Fixr (2025) |
| Sprinkler system installation | $2,530 | HomeAdvisor (with a rain barrel setup) |
| Irrigation and sprinkler installation | $4,000 – $7,000 | Fixr (2025) (with a wet system) |
| Water treatment system | $2,500 – $3,000 | Fixr (2025) |
| Water meter | $50 – $100 | Fixr (2025) |
| Well drilling (for comparison) | $15 – $60 per linear foot | Angi |
Downspout and average gutter figures match across publishers; these are separately published figures, and the pages state no shared sourcing. The two gutter-installation figures and the two sprinkler figures cover different scopes and are not compared directly. Angi and Fixr both note that some local water departments and municipalities offer basic rain barrels at no cost, so it is worth checking local programs before buying.1,3
Frequently asked questions
How much does a rain barrel cost?
Fixr prices a rain barrel at $120 – $160 for the unit itself, while HomeAdvisor prices a 100-gallon rain barrel installed at $120 – $2,160 depending on material and labor; the scopes differ and are not compared directly. HomeAdvisor adds that most homeowners pay $140 for a 40- to 60-gallon barrel, with barrel prices running $0.50 – $4.00 per gallon.2,3
What is the difference between a dry and a wet system?
As the sources describe them: a dry system stores water in an above-ground tank near the home, and its collection pipes stay empty between rainfalls. A wet system runs pipes underground that stay filled with water, feeding a typically below-ground tank – which is why wet systems cost more to install.2,3
What does a rainwater collection system cost to keep up?
Angi and HomeAdvisor put filtration upkeep at about $740 per year for systems with filtration, with UV bulb and filter replacements at $250 per year and gutter cleaning at $160 – $170 per cleaning; HomeAdvisor adds pump replacement at $1,800 every 20 years. A basic rain barrel without filtration needs only periodic cleaning.1,2
Related guides
French Drain Cost
Yard Drainage Cost
Drip Irrigation Cost
Seamless Gutter Cost
All cost guides
Sources
1. Angi — Collecting Rainwater: What’s the Cost of a Cistern? (2026 data)
2. HomeAdvisor — How Much Does a Rainwater Collection System Cost? (2025 data)
3. Fixr — Rainwater Collection System Cost (2025)
4. CDC — Collecting Rainwater and Your Health: An Overview