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About System Scores
A system score is a point-based value that provides a comprehensive approach for assessing a water system's level of compliance. A single value is calculated for each water system based on compliance with all rules, instead of using the rule-based SNC (significant non-compliance) status which was based on failure to comply with individual drinking water rules. System scores are used to identify systems that are a high priority for enforcement (see
Priority Non-Compliers, below).
Priority Non-Compliers (PNCs)
When a water system's system score reaches 11 or higher, the system is considered to be a priority non-complier (PNC). The system remains a PNC until its system score falls below 11 and all MCL violations have been addressed.
How System Scores Are Calculated
The system score is based on all unaddressed violations (those that have not been returned to compliance and are not under formal enforcement) for monitoring periods ending within the last five years. Violations for monitoring periods ending more than five years ago and those that have been addressed are not counted in the system score. Each violation type is assigned a point value indicating its relative threat to public health, or severity (see the
points table, below). The system score is calculated by adding together the points of the unaddressed violations and adding a time factor; the time factor is the number of years that the oldest violation has been unaddressed (from 0 to 5 years). For each water system, a system score is calculated using this formula:
System Score = Sum (S1, S2, S3, ...) + n
where S represents the points for each violation and
n represents the time factor. Water systems with a system score of 11 and higher are considered a higher priority for enforcement.
Notes:
- The time factor (n) is calculated as the number of months between the violation's monitoring period end date and the current date divided by 12 months/year. The resulting number of years is rounded down to the nearest whole year.
- System scores on Data Online are based on the 5-year period from today's date and reflect all data currently in the Drinking Water Services' database.
- View current system scores here.
Violation Severity Factors (Points)
Violation Description |
Points |
Acute MCL for E. coli |
10 |
Acute MCL for Fecal Coliform or E. coli |
10 |
Chemical MCL based on 1 Sample, Nitrate |
10 |
Chemical MCL based on Average of Samples, Nitrate |
10 |
Failure to Install or Use SW Treatment |
10 |
Failure to Maintain 4-log Treatment |
10 |
Failure to Maintain EP Disinfection |
10 |
Failure to Meet CT, Swtr |
10 |
Turbidity Standards Not Met (95% NTU) |
10 |
Turbidity Standards Not Met (Max NTU) |
10 |
Action Level Exceeded |
5 |
Chemical Late/Nonreporting, Nitrate |
5 |
Chemical MCL based on 1 Sample |
5 |
Chemical MCL based on Average of Samples |
5 |
Chemical MCL based on Locational Average of Samples |
5 |
Coliform Investigation Defects Not Corrected |
5 |
Coliform Investigation Nonreporting |
5 |
Corrosion Control Non-Compliance |
5 |
Deficiencies Not Corrected or Plan Not Received |
5 |
Failure to Collect MPA Sample |
5 |
Failure to Correct Source Contamination |
5 |
Failure to Install CC Treatment |
5 |
Failure to Install Disinfection |
5 |
Failure to Meet Enforcement Deadline |
5 |
Failure to Replace Plumbing |
5 |
Failure to Submit CCT Recommendation |
5 |
Failure to Treat for Cryptosporidium |
5 |
|
Violation Description |
Points |
No Designated DRC |
5 |
No Qualified Treatment Plant Operator |
5 |
Prevented Level 2 Investigation |
5 |
Public Education Late/Nonreporting |
5 |
Repeat Coliform - Did Not Report ANY |
5 |
Repeat Coliform - Did Not Report Enough |
5 |
Repeat Coliform - Late/Nonreporting |
5 |
Total Coliform MCL |
5 |
CCR Late/Nonreporting |
1 |
Chemical Late/Nonreporting |
1 |
Consumer Notification of Results Late/Nonreporting |
1 |
Corrosion Control Late/Nonreporting |
1 |
DBP Late/Nonreporting |
1 |
LCR Late/Nonreporting |
1 |
Monthly GW Compliance Report - Late/Nonreporting |
1 |
Monthly SW Report - Late/Nonreporting |
1 |
Public Notice Late/Nonreporting |
1 |
Raw Source Monitoring Incorrect Sample Date |
1 |
Raw Source Monitoring Late/Nonreporting |
1 |
Routine Coliform - Did Not Report ANY |
1 |
Routine Coliform - Did Not Report Enough |
1 |
Source Assessment Sample - Late/Nonreporting |
1 |
Source Sample - Late/Nonreporting |
1 |
Temporary Routine Coliform - Did Not Report ANY |
1 |
Temporary Routine Coliform - Did Not Report Enough |
1 |
Treatment Requirements Not Met |
1 |
|
See list of SDWIS codes |
Service Area Types
Schools and day care centers:
Day care centerSchoolManufactured housing parks:
Mobile home parkMobile home park,princ. res.Residential areas:
Residential areaSubdivisionHomeowners associationOther residential areaMunicipalities:
Municipality
Additional Service Area Types
DispenserHighway rest areaHotel/motelIndustrial/agriculturalInstitutionInterstate carrierMedical facilityOther areaOther non-transient areaOther transient areaRecreation areaRestaurantRetail employeesSanitary improvement districtSecondary residencesService stationSummer campWater bottlerWholesaler (sells water)
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