Market report · August 2026
Water Mill housing market report
Suffolk County · Data as of October 2, 2026 · Based on OneKey® MLS · Updated monthly
12-month median price down 51.2%; inventory about flat; buyer's market
Market temperature · months of supply
13.9 months · buyer's market
Median sale price
$1.75M
Last year $7.6M · −77.0%
Closed sales
2
Last year 1 · +100.0%
Homes for sale
29
Last year 29 · 0.0%
Avg. days on market
161 days
Last year 31 days
% of original list
87.0%
Last year 92.1%
New listings
5
Last year 2 · +150.0%
Month and last 12 months
| Metric | August 2025 | August 2026 | Change | Thru 08/2025 | Thru 08/2026 | Change |
|---|---|---|---|---|---|---|
| New listings | 2 | 5 | +150.0% | 51 | 45 | −11.8% |
| Closed sales | 1 | 2 | +100.0% | 12 | 25 | +108.3% |
| Avg. days on market | 31 | 161 | +419.4% | 108 | 169 | +56.5% |
| Median sale price | $7,600,000 | $1,747,500 | −77.0% | $6,550,000 | $3,195,000 | −51.2% |
| % of original list | 92.1% | 87.0% | −5.5% | 92.3% | 89.0% | −3.6% |
| Homes for sale / Avg. homes for sale | 29 | 29 | 0.0% | 28 | 25 | −10.7% |
From 2013-03 to 2026-08, the rolling 12-month median moved from $3.4M to $3.19M.
Highlights
- 5-year median −0.2%
- 0% sold above original list in 12 months
- $5M+ is the busiest band · 32% of sales
For sale today
Water Mill Single-family 25 homes
12-month median price about flat; inventory down 100.0%; seller's market
Market temperature · months of supply
0 months · seller's market
Median sale price
—
Last year —
Closed sales
0
Last year 0
Homes for sale
0
Last year 3 · −100.0%
Avg. days on market
—
Last year —
% of original list
—
Last year —
New listings
0
Last year 0
Month and last 12 months
| Metric | August 2025 | August 2026 | Change | Thru 08/2025 | Thru 08/2026 | Change |
|---|---|---|---|---|---|---|
| New listings | 0 | 0 | — | 3 | 0 | −100.0% |
| Closed sales | 0 | 0 | — | 16 | 2 | −87.5% |
| Avg. days on market | — | — | — | 375 | 139 | −62.9% |
| Median sale price | — | — | — | $2,245,000 | $2,229,500 | −0.7% |
| % of original list | — | — | — | 93.8% | 88.9% | −5.2% |
| Homes for sale / Avg. homes for sale | 3 | 0 | −100.0% | 1 | 0 | −100.0% |
From 2015-05 to 2026-08, the rolling 12-month median moved from $2.15M to $2.23M.
For sale today
Water Mill Condo 0 homes
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Source: OneKey® MLS, calculated by Homix following OneKey's market report method; figures may differ slightly from OneKey's own reports. Prices do not account for concessions or down-payment assistance; small samples can make percent changes look extreme.