Public water system record
Riverview Colony
On record as serving Chester, Liberty County, MT · Serves 130 people
Federal records show 16 health-based violations and 1 monitoring/reporting issue for Riverview Colony in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.
System profile
- Health-based violations, last 10 years
- 16
- Resolved
- 16
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Riverview Colony buys its water from Ncmrwa Tiber Service Area.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 93 µg/L, federal limit 60 µg/L (1.6 times the limit), 2020.
- Most recent formal enforcement: compliance order (no penalty) by Montana, May 2020.
- Record on file since 1981, with 6 health-based violations before October 20, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 13 service lines.
Check whether Riverview Colony 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 |
|---|---|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jul 1, 2023 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 62.5 µg/L, federal limit 60 µg/L (at or just above the limit)
|
220 | Apr 1, 2021 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 70 µg/L, federal limit 60 µg/L (1.2 times the limit)
|
220 | Jan 1, 2021 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 77 µg/L, federal limit 60 µg/L (1.3 times the limit)
|
220 | Oct 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 77 µg/L, federal limit 60 µg/L (1.3 times the limit)
|
220 | Jul 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 82 µg/L, federal limit 60 µg/L (1.4 times the limit)
|
220 | Apr 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 93 µg/L, federal limit 60 µg/L (1.6 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 88 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 85 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 88 µg/L, federal limit 60 µg/L (1.5 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 88.5 µg/L, federal limit 60 µg/L (1.5 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 89.3 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 88.8 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 79.3 µg/L, federal limit 60 µg/L (1.3 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 65.3 µg/L, federal limit 60 µg/L (1.1 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61.5 µg/L, federal limit 60 µg/L (at or just above the limit)
|
220 | Oct 1, 2018 | 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
|
Oct 1, 2021 | Resolved |
Full record since 1981
EPA's records for Riverview Colony go back to 1981. Before October 20, 2016 they list 6 health-based violations (6 resolved) and 45 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 8 |
| 1990s | 3 | 9 |
| 2000s | 1 | 28 |
| 2010 to October 19, 2016 | 2 | 0 |
| October 20, 2016 to 2019 | 8 | 0 |
| 2020s | 8 | 1 |
Most recent health-based violation before October 20, 2016: Total Trihalomethanes (TTHMs), began January 2015, Resolved.
Show all 6 health-based violations before October 20, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0845 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Oct 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2008 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 1994 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1994 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1993 | Resolved |
Enforcement actions
Montana regulators took 2 formal enforcement actions against Riverview Colony and issued 1 boil water order between 1993 and 2020, filed as 9 records in EPA's data. The most recent was a compliance order (no penalty) in May 2020.
| Date | By | Action | Violations covered |
|---|---|---|---|
| May 20, 2020 | Montana | Compliance order (no penalty) | 16 violations (16 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Mar 23, 2010 | Montana | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Oct 31, 1993 | Montana | Boil water order | 1 violation: Total Coliform |
What the violations mean
Haloacetic Acids (HAA5)
12 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Total Trihalomethanes (TTHMs)
4 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Riverview Colony buys its water from Ncmrwa Tiber Service Area. It lists no wells or intakes of its own.
Buys water from
- Ncmrwa Tiber Service Area Helena, MT
Annual water quality report
Riverview Colony 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 Riverview Colony 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 Montana.
Certified drinking water labs by state EPA guidance for private wells