Community Water System · PWS MN1020005
GreyStone MHP
Operator location Watertown, Minnesota - smaller served population (≤ 999) at 500 people served; 65 SDWIS violations on record from groundwater sources.
- 500
- People served (this PWS)
- 65
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
GreyStone MHP standing, mid SDWIS violation third
500 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%). Population rank #29,169 of 29,740 among systems serving 500+.
The verdict
GreyStone MHP lands in the middle third by violation volume (65), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (500; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #29,169 of 29,740
- Population · /systems
- #630 of 677
- Population · MN
- 65
- Total EPA violations on record
- 14%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 163
- County
- Anoka
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 56
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 22 | 2017 |
| Coliform (TCR) | MR | 19 | 2014 |
| Lead and Copper Rule | MR | 11 | 2012 |
| Coliform (TCR) | MCL | 9 | 1992 |
| Revised Total Coliform Rule | MON | 4 | 2017 |
Violation Count vs. the National Corpus
GreyStone MHP has 65 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 36% carry more. 14% of this system's own violations are health-based (9 of 65), and it ranks #29,169 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
65 Around the middle fewer violations than 36% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for GreyStone MHP
EPA SDWIS lists 500 people served and 163 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
65 violations · 500 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with GreyStone MHP
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Minnesota compares on the same EPA violation measures. Minnesota systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.