Non-Transient Non-Community Water System · PWS CO0202300
Great Sand Dunes Hq
Operator location Mosca, Colorado - 8% of 52 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 1,400 served per SDWIS.
- 1,400
- People served (this PWS)
- 52
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Great Sand Dunes Hq standing, mid SDWIS violation third
8% of 52 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 8% is middle-third health share (≤ 23%). Population rank #16,526 of 29,740 among systems serving 500+.
The verdict
Great Sand Dunes Hq lands in the middle third by violation volume (52), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,400 (mid served population (≤ 3,309)). Health-based share is 8% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #16,526 of 29,740
- Population · /systems
- #297 of 551
- Population · CO
- 52
- Total EPA violations on record
- 8%
- 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
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 16
- County
- Alamosa
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 45
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 12 | 2020 |
| Revised Total Coliform Rule | MON | 6 | 2021 |
| Coliform (TCR) | MR | 6 | 2008 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 4 | 2024 |
| Barium | MR | 3 | 2002 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2011 |
| Chlorine | MR | 3 | 2019 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2019 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2024 |
| Antimony, Total | MR | 3 | 2002 |
| TTHM | MR | 3 | 2019 |
| Public Notice | Other | 2 | 2020 |
Violation Count vs. the National Corpus
Great Sand Dunes Hq has 52 recorded EPA violations, 57% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 42% carry more. 8% of this system's own violations are health-based (4 of 52), and it ranks #16,526 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)
52 Around the middle fewer violations than 42% 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
Health-based violations on Great Sand Dunes Hq
4 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CO0202300.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
52 violations · 1,400 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Great Sand Dunes Hq
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.