Public water system record
Lower Brule Rural Water Supply System
Serves an area of Lyman County, SD that includes West Brule and Lower Brule · 1,637 people served
Federal records show 1 health-based violation and 13 monitoring/reporting issues for Lower Brule Rural Water Supply System in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 13
Key facts
- Lower Brule Rural Water Supply System draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit), 2021.
- Record on file since 1983, with 6 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 546 unknown out of 892 service lines.
Check whether Lower Brule Rural Water Supply System serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2021 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Nov 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Sep 29, 2022 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
CYANIDE
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
E. coli
Monitoring and reporting
|
May 1, 2018 | Resolved |
|
Radium-228
Monitoring and reporting
|
Jan 1, 2015 | Resolved |
|
Radium-226
Monitoring and reporting
|
Jan 1, 2015 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jan 1, 2015 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Jan 1, 2015 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Jan 1, 2015 | Resolved |
Full record since 1983
EPA's records for Lower Brule Rural Water Supply System go back to 1983. Before October 19, 2016 they list 6 health-based violations (1 resolved, 5 archived by EPA without a recorded fix) and 85 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 9 |
| 1990s | 5 | 65 |
| 2000s | 1 | 6 |
| 2010 to October 18, 2016 | 0 | 5 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 1 | 7 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began October 2002, Resolved.
Show all 6 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1992 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1991 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1991 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1991 | Archived |
What the violations mean
Total Trihalomethanes (TTHMs)
1 incidentDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Lower Brule Rural Water Supply System draws water from 1 surface water intake.
Annual water quality report
Lower Brule Rural Water Supply System must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by EPA Region 8.
Certified drinking water labs by state EPA guidance for private wells