TABLE 340.1
Inorganic Chemicals

SUBSTANCE

PMCL (mg/L)

Antimony

0.006

Arsenic

0.010^a

Asbestos

7 million fibers/liter (longer than 10 µm)

Barium

2

Beryllium

0.004

Cadmium

0.005

Chromium

0.1

Cyanide (as free Cyanide)

0.2

Fluoride

4.0^b

Mercury

0.002

Nickel

No limits designated

Nitrate (as N)

10^c

Nitrite (as N)

1.0^c

Total Nitrate and Nitrite (as N)

10^c

Selenium

0.05

Thallium

0.002

SUBSTANCE

SECONDARY MAXIMUM CONTAMINANT LEVEL (mg/L)

Aluminum

0.05-0.2^d

Chloride

250^c

Copper

1.0

Corrosivity

Noncorrosive

Fluoride

2.0

Foaming agents

0.5^e

Iron

0.3

Manganese

0.05

Silver

0.1

[ Sodium ]

[ No limits designated^f ]

Sulfate

250^c

Zinc

5

SUBSTANCE

ACTION LEVEL (mg/L)

Lead

0.015

Copper

1.3

^aArsenic sampling results shall be reported to the nearest 0.001 mg/L.
^bThe fluoride PMCL applies only to community waterworks.
^cSignificant figures are noted as shown. For values with trailing zeros, significant figures are noted as shown. The limits for nitrate and nitrate-nitrite have two significant figures. The limits for chloride and sulfate have three significant figures.
^dVarying water quality and treatment situations necessitates a flexible range for the aluminum SMCL. The owner is encouraged to maintain an aluminum concentration as low as possible. If the aluminum concentration in the finished water causes discoloration, then the owner is urged to contact the department.
^eConcentrations reported in terms of Methylene Blue Active Substances.
[ ^fMonitoring and reporting in accordance with 40 CFR 141. 41 and 12VAC5-590-372 D 6. ]

TABLE 340.7
Maximum Residual Disinfectant Level Goals (MRDLG) and Maximum Residual Disinfectant Levels (MRDL) for Disinfectants

RESIDUAL DISINFECTANT

[ MRDLG and ] MRDL (mg/L)

Chlorine

4.0 (as Cl₂)^a

Chloramines

4.0 (as Cl₂)^a

Chlorine Dioxide

0.8 (as ClO₂)

^aChlorine and chloramines have two significant figures.

Table 570.13
UV Disinfection

All waterworks using ultraviolet (UV) disinfection must report the following:

Total run time, hours (per unit)
Lamp status for each reactor train
Lamp age for each reactor train
Total production, MGD or gpd
Flow Rates, minimum, maximum and average, MGD or gpd for each reactor train

To receive disinfection credit, the following shall also be reported:

Number of off-specification events
Total off-specification volume, gal
Percent off-specification volume
UV Intensity setpoint, [ W/m2 W/m² ] (if using intensity setpoint approach, daily)
UV Intensity for each reactor, minimum, [ W/m2 W/m² ] (if using intensity setpoint approach, daily)
UV Intensity sensor calibration date for each reactor
Required dose, [ mJ/cm2 mJ/cm² ] (if using calculated dose approach)
UV Transmittance (UVT) for each reactor, daily percentage (if using calculated dose approach)
Calculated dose for each reactor, daily minimum, [ mJ/cm2 mJ/cm² ] (if using calculated dose approach)
Validated dose for each reactor, daily minimum, [ mJ/cm2 mJ/cm² ] (if using calculated dose approach)
UVT analyzer calibration date (if using calculated dose approach)
UV intensity sensor correction factor

[ Table 570.14
Ozone Disinfection

All waterworks using ozone disinfection must report the following:
Ozone applied, lb/day and mg/L.
Bromate concentration (mg/L), at the entry point to the distribution system, monthly.

To receive disinfection credit, the waterworks shall also report:
Minimum ozone concentration C_initial from first sample point (Effluent Method) or C_geo (Log Integration Method) in all contactors during peak flow, daily.
Minimum and average ozone concentration C_final (mg/L) for each contactor in service, daily.
Log Inactivation by ozonation, for Giardia, virus and, if applicable, Cryptosporidium, daily at peak flow and the minimum CT, daily. ]