Community Water System · PWS CO0149160
Buttermilk MD
Operator location Basalt, Colorado - smaller served population (≤ 999) at 200 people served; 756 SDWIS violations on record from surface water sources.
- 200
- People served (this PWS)
- 756
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Buttermilk MD standing, high SDWIS violation third
200 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%).
The verdict
Buttermilk MD sits in the upper third of the sitemap cohort by violation count (756), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (200; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 756
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
- 200
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 64
- County
- Pitkin
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 731
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 26 | 2025 |
| Chlorine | MR | 25 | 2024 |
| Public Notice | Other | 16 | 2025 |
| Di(2-ethylhexyl) phthalate | MR | 15 | 2009 |
| Nitrate | MR | 14 | 2007 |
| Fluoride | MR | 13 | 2007 |
| Total Haloacetic Acids (HAA5) | MR | 13 | 2025 |
| Arsenic | MR | 12 | 2007 |
| Barium | MR | 12 | 2007 |
| Cadmium | MR | 12 | 2007 |
| Nickel | MR | 12 | 2007 |
| Antimony, Total | MR | 12 | 2007 |
| Thallium, Total | MR | 12 | 2007 |
| Chromium | MR | 12 | 2007 |
| Mercury | MR | 12 | 2007 |
| Selenium | MR | 12 | 2007 |
| Surface Water Treatment Rule | MR | 12 | 2024 |
| Beryllium, Total | MR | 12 | 2007 |
| Coliform (TCR) | MR | 10 | 2011 |
| TTHM | MR | 10 | 2025 |
| Revised Total Coliform Rule | MON | 10 | 2017 |
| Toluene | MR | 9 | 2009 |
| Ethylbenzene | MR | 9 | 2009 |
| Styrene | MR | 9 | 2009 |
| Endrin | MR | 9 | 2006 |
| BHC-GAMMA | MR | 9 | 2006 |
| Methoxychlor | MR | 9 | 2006 |
| Dalapon | MR | 9 | 2006 |
| Diquat | MR | 9 | 2006 |
| Picloram | MR | 9 | 2006 |
Violation Count vs. the National Corpus
Buttermilk MD has 756 recorded EPA violations, 98% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 2% carry more. 1% of this system's own violations are health-based (4 of 756), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
756 Higher than most more violations than 98% 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 Buttermilk MD
EPA SDWIS lists 200 people served and 64 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
756 violations · 200 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.
What to do with Buttermilk MD
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.