Gregory, SD Water Safety: 83/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Across Gregory, EPA monitoring data shows low violation rates and healthy safety margins — a pattern that places the city well above SD's average for drinking water compliance across recent reporting cycles.
How Gregory Compares
Data: EPA SDWIS Last verified: 2026-06-03
Gregory Water: The Quick Version
- Average lead level: 0.003 mg/L.
- Homes built before 1986: 81% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 14.84 — above typical levels.
Water Systems Serving Gregory
Water supply in Gregory, SD follows a divided structure: 2 utilities account for the largest share of residential service out of 2 total systems, each managing its own distribution network and EPA reporting. Because these systems operate independently, rate decisions and compliance outcomes are determined separately.
Overview
We track water quality and home safety data for 1 ZIP code in Gregory, South Dakota (population ~1,633), covering 2 community water systems serving approximately 6,081 people region-wide.
No EPA violations recorded across any ZIP codes in Gregory — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Gregory: B (83/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Gregory water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0030 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 57533 | B | TRIPP COUNTY WATER USER DISTRICT | 4,860 |
All ZIP Codes in Gregory
- 57533 [B]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Gregory
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
How Old Is Gregory's Housing Stock?
With 81% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Federal plumbing rules changed in two stages — lead pipes were phased out before 1970, and lead solder was banned in 1986 — but in Gregory, where the median build year is 1953, most of the housing was already in place before those rules took effect. The materials installed under older standards remain embedded in a substantial portion of the residential inventory today.
Over half of homes in Gregory were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Gregory: Remediation Cost in Perspective
Placing remediation in the context of Gregory's property market, the equity share is low — most homeowners here are weighing a financial commitment that fits comfortably within routine property planning, far from the threshold where remediation becomes a material equity decision rather than a standard upkeep consideration.
Remediation costs in Gregory are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 35% below the South Dakota average.
Protecting Children from Lead in Gregory
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Wherever 81% of local housing was built before solder rules changed — as is the case in Gregory — a faucet-level sample closes the gap that aggregate utility data cannot.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Gregory, SD