Community Water System · PWS CO0101063
Greatrock North WSD
Operator location Broomfield, Colorado - upper-third violation load (> 74 violations) with 89 EPA violations; groundwater source; 1,250 served (PWS-level, not municipal population).
- 1,250
- People served (this PWS)
- 89
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Greatrock North WSD standing, high SDWIS violation third
89 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #17,458 of 29,740 among systems serving 500+.
The verdict
Greatrock North WSD sits in the upper third of the sitemap cohort by violation count (89), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,250 (mid served population (≤ 3,309)). Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #17,458 of 29,740
- Population · /systems
- #312 of 551
- Population · CO
- 89
- Total EPA violations on record
- 9%
- 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
- Local
- Connections
- 500
- County
- Adams
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 75
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 48 | 2009 |
| Interim Enhanced Surface Water Treatment Rule | MR | 21 | 2009 |
| Coliform (TCR) | MCL | 8 | 2008 |
| Coliform (TCR) | MR | 6 | 2006 |
| Consumer Confidence Rule | Other | 6 | 2011 |
Violation Count vs. the National Corpus
Greatrock North WSD has 89 recorded EPA violations, 71% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 29% carry more. 9% of this system's own violations are health-based (8 of 89), and it ranks #17,458 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)
89 Around the middle fewer violations than 29% 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
SDWIS compliance record for Greatrock North WSD
89 violations on record for CO0101063; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
89 violations · 1,250 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Greatrock North WSD
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Colorado compares on the same EPA violation measures. Colorado 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.