Public water system record
Blackwater PWS
Serves Blackwater, Cooper County, MO · 181 people served
Federal records show 9 health-based violations and 10 monitoring/reporting issues for Blackwater PWS 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
- 9
- Resolved
- 9
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 10
Key facts
- Blackwater PWS buys its water from Saline County PWSD 3.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 122 µg/L, federal limit 80 µg/L (1.5 times the limit), 2016.
- Most recent formal enforcement: compliance order with a penalty by Missouri, September 2018.
- Record on file since 1994, with 7 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 107 unknown out of 107 service lines.
Check whether Blackwater PWS 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 91 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 105 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
220 | Jul 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101.6 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 97.85 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 106 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 113 µg/L, federal limit 80 µg/L (1.4 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 115 µg/L, federal limit 80 µg/L (1.4 times the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 122 µg/L, federal limit 80 µg/L (1.5 times the limit)
|
220 | Oct 1, 2016 | 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
|
Mar 1, 2025 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Public Notice
OTHER
|
Jun 27, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2019 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2019 | Resolved |
Full record since 1994
EPA's records for Blackwater PWS go back to 1994. Before October 19, 2016 they list 7 health-based violations (3 resolved, 4 archived by EPA without a recorded fix) and 27 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 4 | 8 |
| 2000s | 0 | 19 |
| 2010 to October 18, 2016 | 3 | 0 |
| October 19, 2016 to 2019 | 8 | 2 |
| 2020s | 0 | 8 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.
Show all 7 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 122 µg/L, federal limit 80 µg/L (1.5 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 126 µg/L, federal limit 80 µg/L (1.6 times the limit)
|
Jul 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 93 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
Apr 1, 2016 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1996 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1994 | Archived |
Enforcement actions
Missouri regulators took 3 formal enforcement actions against Blackwater PWS between 1995 and 2018. The most recent was a compliance order with a penalty in September 2018.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 7, 2018 | Missouri | Compliance order with a penalty | 9 violations (9 health-based): Total Trihalomethanes (TTHMs) |
| Jan 10, 2003 | Missouri | Signed compliance agreement | 9 violations: Total Coliform |
| Dec 15, 1995 | Missouri | Signed compliance agreement | 7 violations (4 health-based): Total Coliform |
What the violations mean
Total Trihalomethanes (TTHMs)
9 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Blackwater PWS buys its water from Saline County PWSD 3. It lists no wells or intakes of its own.
Buys water from
- Saline County PWSD 3 Marshall, MO
Annual water quality report
Blackwater PWS 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.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Blackwater PWS for a copy.
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 Missouri.
Certified drinking water labs by state EPA guidance for private wells